Sudo echo permission denied ubuntu. /drop-caches implies it is in the current directory.
Sudo echo permission denied ubuntu 133 raw. In this case you would have to use cd /directory-name first. As mentioned above, the recommended way is to use tee, as in echo stuff | sudo tee /some/file/path Oct 22, 2021 · Why do you have permission deny error? Maybe you need to give your script rights to execute (eg. slice/myfolder/myfolder/myfolder/cgroup. I'm sort of new with Ubuntu/Linux so this is why I ask for the easiest way. I would very much like to, I have tried logging in as root and changing the ownership and changing the permissions, please help. My account has full root properties but still I get the error: Permission denied. When I try to open the file I get Jun 21, 2021 · but since I cant remember my root password and this is a remote server I can only use sudo. Cannot open /dev/ttyS0: Permission denied I would like to be able to use serial port terminal, or equivalent with Xubuntu so I can use my kpc3 packet terminal, connect to the com port on the back of my computer. Apr 13, 2016 · sudo 'echo "127. Learn essential sudo command usage, Linux permission management, and troubleshoot access denied errors with comprehensive security best practices for system administrators. Dec 30, 2018 · I made a directory called "shadi" and set this permission for it sinoosh@ubuntu:/home$ ls -ld shadi drwxr-xrwx 2 root root 4096 Jul 1 01:58 shadi In this situation I have "others" permissions, bu Apr 29, 2015 · I want to block usb mass storage in some of the systems in the LAN. Open a terminal and cd into the /usr/bin folder of that installation you mounted from above. Also, I need this in a regularly used script, how can I make it so that I don't have to type in my password for it to work??? Mar 16, 2019 · The reason for the error message is that while echo is executed using sudo, >> /etc/my. The echo is executed using the superuser privilege while the current shell (with normal user privilege) tries to write to /proc/sys/kernel/randomize_va_space, and thus triggers a Permission denied error. asc 然后，我们使用 sudo 并配合 echo 命令再次向修改权限之后的 test. However, you can choose any editor to make changes. May 1, 2020 · I am trying to edit the file /proc/sys/vm/overcommit_memory, but I'm getting permission denied even if I use sudo or switch to root user via sudo -i and try to edit using that account. root test. 04) system it looks like the pseudofile has w but not r permission (perhaps this is a kernel 6. Can someone please tell me what sudo echo nameserver 8. This issue typically occurs because the user does not have the correct permissions to access the Docker daemon. Mar 8, 2023 · Yet, when trying to execute the following command: sudo -H -u myuser bash -c 'echo some_existing_pid > /sys/fs/cgroup/system. Oct 27, 2025 · Have you encountered the Linux Permission denied error? Below, I'll explain how to use sudo command, change file permissions and ownership. echo "password" > ~/. Following command gives a permission error: echo "xyz" > abc. cat is used to concatenate files and print on the standard output. sudo only applies to the first command it's mentioned on, when you introduce a pipe or a redirect, that becomes a separate command being executed in sequence by the shell. I can create files in my home directory using normal permissions, so something like this works for example: vi / Nov 16, 2018 · Kamil Maciorowski pointed you in the right direction (hence my +1 for him), but it appears there is something very wrong with your /bin/echo command: here is mine, # ls -l echo -rwxr-xr-x 1 root root 35000 gen 18 2018 echo and here is yours (and I quote): $ sudo ls -al /bin/echo -rwxr-xr-x 1 root utmp 0 Nov 11 18:05 /bin/echo Can you see the differences? Your command belongs to the utmp group Jan 4, 2024 · 避免’sudo echo x >’ 时’Permission denied’ 甲： 示例 sudo echo a > 1. You could produce a shell script that does the echo >> part and sudo execute the script. 8 > /etc/resolv. This is a pretty simple question, at least it seems like it should be, about sudo permissions in Linux. I am running the script as default admin in ubuntu. txt: Permission denied When I use sudo nano, I can save something to this file. txt -bash: 1. asc -bash: test. /drop-caches implies it is in the current directory. Oct 31, 2015 · When you run the command sudo echo 4 > /sys/class/gpio/export, it first executes sudo echo 4 which runs echo with elevated privileges (which is kind of pointless). The /sys directory in Linux is part of the virtual filesystem and is protected. We know if we execute a command with sudo, the command will be executed as the root user. Dec 8, 2012 · This is the shell command that results in "Permission denied" when I'm trying to append the data in a file to another file with sudo: sudo cat add_file >> /etc/file The file at /etc/file is May 7, 2013 · I want to cd into /var/named but it gives me a permission denied error, and when I want to use sudo to do this I am not permitted. I am afraid you need to learn a bit about standard permissions or even ACLs, Selinux policy, setuid, sticky bits, etc. But the script is no Nov 3, 2016 · I have recently started using Terminal, and I have been having lots of problems installing programs from the Ubuntu Software Center (Minecraft, TOR, Tails installer, etc. May 7, 2012 · Since I updated from Ubuntu 10. sh #!/bin/bash sync && echo 1 | tee /proc/ Jan 8, 2015 · 使用sudo echo ‘xxx’ > /path/file 时，其实sudo只用在了 echo 上，而重定向没有用到sudo的权限，所以会出现“Permission denied”的情况，解决的方法也很简单，就是一个参数而已。加一个“ sh -c ”就可以把权限指定到整条shell了。 Linux How To echo as root solution to use tee permission denied solution Ubuntu Debian Mint Redhat CentOS The issue is when you need to echo something as root/sudo, that it doesn't work. Use tee instead so that sudo runs the process that actually opens the file for writing. If I do sudo su before the command (trying it out by hand in an ssh session), then it works. That's why you get the access violation. cnf is run as normal user (not root). 8. Using commands like 'sudo', 'chmod', and 'chown' allows you to gain the necessary access and maintain a secure environment. #2) Think before you type. procs' I get the following error: bash: line 1: echo: write error: Permission denied What can be a possible reason for that? OS: Ubuntu 22. In other distribution like Suse you'll have the ability to use # su instead of # sudo -s echo > list If you need root privileges you first have autenticate as root using su - now you can echo > list now you can logout as root using logout This because the redirect is done before sudo starts, that's why you get "permission denied" without being asked for password. However, when I do the same after sudo su, everything works. By understanding the fundamental concepts of file and directory permissions, user and group management, and the proper use of sudo, you can effectively identify and resolve these errors. What's reputation and how do I get it? Instead, you can save this post to reference later. I switched to root using su and # echo 10 > brightness changed my brightness almost instantly. chmod +x test_image. In your case, you're trying to modify driver_override files, which need higher privileges. There is a Unix. There are a lot of times when I just want to append something to /etc/hosts or a similar fil See full list on adamsdesk. conf Permission denied The weird thing is I've been (successfully) using sudo for pretty much every command that required su privileges. If you put the script in /usr/local/bin there is no need to use . May 2, 2020 · A blog about technology, security, cyber security, servers, virtualization, computers, cloud computing, guides, tips, DevOps, coding, anything technology etc. However, it fails like this:- sudo echo "[archlinuxfr]" &g Possible Duplicate: Redirecting stdout to a file you don't have write permission on Running a command like sudo echo 'text' >> /file. This grants you the necessary access to bypass permission restrictions and read the file content. There are multiple solutions to this, if it is a one time thing just run your shell as root (sudo -s or simply sudo bash) and run the command without sudo. Therefore, remember to open the “hosts” file using the “sudo” keyword at the start of the command or by using the sudo shell. Dec 25, 2021 · I want to replace its content with something else using sudo but it fails: "sudo ls -l > s" gives permission denied. Jan 3, 2014 · I came across this weird problem just now and I can't seem to get to the bottom of it. Bash (which is running as a normal user) executes 'sudo echo 300' then takes I thought this would be easy using sudo, but it returns "permission denied" when I try to add >> to the hosts file, but it works if I try replace > the hosts contents. To append to the restricted file, you need to elevate privilege on the file operation, not the cat, for example, echo "# foo" | sudo tee -a /etc/apt/sources. bashrc See man tee if you're interested in the technical details of how this works. So I edit crontab with the root user with this command: sudo Jul 29, 2013 · I cannot open my /etc/hosts file. asc 文件中写入信息： $ sudo echo "又一行信息" >> test. In the above command we are simply creating a new empty file called list. Reasons behind this? Jul 10, 2016 · How do I use sudo to redirect output to a location I don't have permission to write to? [closed] (15 answers) Jul 31, 2017 · You have to use tee utility to redirect or append streams to a file which needs some permissions, like: echo something | sudo tee /etc/file or for append echo something | sudo tee -a /etc/file because by default your shell is running with your own user permissions and the redirection > or >> will be done with same permissions as your user, you are actually running the echo using the sudo and You could grant yourself persistent su-rights with # sudo -s then your command (do not need to sudo anymore) and exit with # exit EDIT: I assume you're asking Ubuntu-related because your question is tagged with that. When writing to files with > (with or without sudo). An alternate approach is to run a sub-shell as sudo: Jun 7, 2023 · The output redirection >> is perhaps tried to be applied by the shell before the sudo is executed, but the user shell has no permission to do that. Dec 26, 2015 · Just putting sudo in front of the command won't have any effect on whether the redirection can happen, sudo only runs echo as root, the redirection is done by the calling shell before the command is run and so is still being done as the user. txt: Permission denied Why do I get -bash: test: Permission denied when I run sudo echo "xyz" > test The directory permissions are: drwxr-xr-x 3 root root 4096 2014-08-05 16:26 I have no problem creating a file Mount your Ubuntu installation by clicking on the device's icon in the file manager. This didn't work; I got the same blank screen, but found another URL that suggested another windows session mgr like XFCE, so I installed xubuntu desktop: $ sudo apt-get install xubuntu-desktop $ echo "xfce4-session" > ~/. This is sudo working as intended. 04 VM in VMware. Whats in the script: clearcache. I would like to get the system to recognize the additional space without a reboot. d/ but get permission denied. 8w次，点赞63次，收藏256次。问题描述：在Ubuntu系统中使用普通用户登录进去，执行一些命令时会提示Permission denied，权限不足问题，这是由于我们使用的是普通用户，而不是系统管理员，有一些文件夹或者命令的操作权限是只有管理员才有的，所以需要对管理员账户进行设置解决方案 Jun 20, 2022 · This is my first real bash script, called makevhost, and I'm running into a permissions error when trying to use sudo to execute commands in the script. ) When I run sudo apt-get Apr 6, 2022 · Open terminal and try to run the following cat command. I am trying to automate the addition of a repository source in my arch's pacman. /a. sh to clear my buffers / cache but when I run it keeps saying Permission denied. You bash runs as your user and doesnt have permissions. Therefore I wanted to test: su adminuser echo "Hello Jun 17, 2025 · Use sudo When Required Sometimes, it’s not about the file — it’s about your privileges. Because the executable permissions bit is not set, even with superuser permission this will fail and create the "Permission denied" message. 権限がないユーザがsudoでコマンドを実行して、かつ、">"でファイル出力する場合、ファイル出力のところで権限がないユーザが実行する事になるので、Permission deniedのエラーが出ます。 Opening vim as sudo -i or sudo - still doesn't let me write to the file. Modifying files here often requires root (or superuser) permissions. (It often involves the least typing, too, when everything is said and done. password && chmod 400 ~/. Did you use sudo to elevate permissions? If done via gui, what tool did you use to perform mount, what type of file system is on the drive? We only know what you tell us May 25, 2015 · echo "[some repository]" | sudo tee -a /etc/apt/sources. xsession Don't forget to sudo /etc/init. bashrc` file from your terminal. Then as your normal user, you are trying to take that output and write to /sys/ Sudo isn't a magic command that elevates privileges for your whole command line. But I think this one is the most elegant of all. d/xrdp restart after all the changes. echo "message1" scp location1:file location2 echo "message1" chmo Apr 5, 2024 · The error "bash: permission denied: /home/user/. Nov 14, 2025 · Conclusion "Permission Denied" errors in Ubuntu are a common occurrence due to the system's strict permission system. 3 This question already has answers here: How to solve "permission denied" when using sudo with redirection in Bash? (7 answers) sudo执行echo命令Permission denied，代码先锋网，一个为软件开发程序员提供代码片段和技术文章聚合的网站。 The problem is that the redirection is done by your shell, not sudo. out. sh before going to Ubuntu 24? The permissions are not supposed to change in the process, are they? Feb 12, 2021 · Some common tools and commands that can be helpful in troubleshooting and solving Permission Denied errors on Ubuntu / Debian Linux include ‘chmod’ to change file permissions, ‘chown’ to change file ownership, ‘sudo’ to run commands with superuser privileges, and ‘ls -l’ to list detailed file permissions. conf does? I used to have random dropping of internet connection for 15 seconds to 3 mins but after using this command, internet connection is working like a charm. The redirection of the output is not performed by sudo. Mar 18, 2024 · It isn’t hard to understand. 101. Feb 8, 2017 · When you try to write as a non-root user, you get a permission error. %e. First, redirections run with the permissions and user of the account managing the shell, not the account running the command so while this doesn't work: sudo echo foo > /bar the following two will: sudo sh -c 'echo foo > / bar' echo foo | sudo tee /bar With the first running both the echo and redirect with elevated permissions and the second only writing as root. It takes the arguments you passed to it and executes them as a program. Learn to modify permissions, change ownership, and set the correct shell for execution. 04 lts OS to download, install and other stuff without introduce each command separately and I have to write in the /etc/profile file to add a PATH environment variable. Feb 19, 2024 · Overcome the Bash "Permission Denied" error with this guide, offering solutions and insights to resolve this common issue and ensure smooth command execution. I have started few days ago with Ubuntu Server and I've got a weird error: ubuntu@ubuntu: $ sudo -s sudo: /var/lib/sudo/ubuntu/ is accessible in write mode from not-owner (040777), should have mod May 30, 2017 · Explains how to append text or add/insert data into a file using sudo command under Linux or Unix with help of tee and other commands. What is the technical reason for this, and is it possible to do this Apr 22, 2003 · You'll need to complete a few actions and gain 15 reputation points before being able to upvote. ) I put "sudo" in front of it - same message. sh If sudo itself returns “Permission denied”, check if your user is in the sudoers group. Sep 22, 2025 · Learn how to fix the 'Permission Denied' error in Linux by adjusting file permissions, changing ownership, or using root access effectively. 0-40-generic However when I put in these commands this is the output: $ sudo sync; 139 When you attempt to modify a file without having write permissions on it, you get an error: > touch /tmp/foo && sudo chown root /tmp/foo > echo test > /tmp/foo zsh: permission denied: /tmp/foo Sudoing doesn't help, because it runs the command as root, but the shell handles redirecting stdout and opens the file as you anyway: Nov 27, 2021 · 【转载】 解决 sudo echo x > 时的 Permission denied错误 版权声明：本文为CSDN博主「Yannick_J」的原创文章，遵循CC 4. An alternate approach is to open an editor with sudo and do the edits manually, i. 1 db-local. 04 LTS Kernel: Linux 5. You could run your service as root. txt. Possible Duplicate: sudo & redirect output I'm trying to create a file in /var/www, but even with sudo this fails: user@debVirtual:/var/www$ sudo echo "hello" > f. Even with sudo echo "/home/user/foo/core. 在ubuntu系统中总提示Permission denied，权限不足问题，代码先锋网，一个为软件开发程序员提供代码片段和技术文章聚合的网站。 How to solve permission denied when using sudo? sudo asks for a password, opens superuser shell and invokes echo “options drm_kms_helper poll=N”, which runs echo command passing it “options drm_kms_helper poll=N” echo, running with root privileges, prints the string to its standard output. Mar 21, 2019 · $ sudo chown root. sudo echo "somethi From a user that is part of the sudoers group, I can normally run any command by doing sudo <command> But the following command fails stating "Permission denied" sudo echo "myhostname" > Nov 21, 2023 · I’m writing a Python script to log into a remote Linux server (dev) as an admin user, then: creating a backup of a file in a directory called Archive dev. As for why the command throws an error is that there are two parts, the echo and the >>. Feb 16, 2022 · The answer to 'I even used sudo su and it still said Permissions denied' is that you probably did not really do sudo su, as that would have worked unless your permissions were screwed up). sh from within a php process running under www-data the following message is received (although I gather that's just from the issue with the permissions not being picked up from the sudoers file?): sudo: no tty present and no askpass program specified EDIT Jul 24, 2023 · This issue is likely because you are not running the script with root permissions. asc: Permission denied 这时，可以看到 bash 拒绝这么做，说是权限不够。 Jun 15, 2021 · You'll need to complete a few actions and gain 15 reputation points before being able to upvote. Sep 10, 2018 · 2 This question already has answers here: Group member cannot write even with write permission (2 answers) Why do I get "Permission denied" when redirecting the output of sudo echo "xyz" to a file? [duplicate] (1 answer) Jan 13, 2025 · $ sudo echo "151. There are multiple solutions: Run a shell with sudo and give the command to it by using the -c option: A few things here. I tried running: echo sudo echo "net. Linux tries to open the file first then run the command (with sudo if present) So in your case the file /etc/onabase is opened as a normal user first, then echo is ran with sudo Some solutions to this would be echo bla bla | sudo tee /etc/onabase, using file editors like vim /etc/onabase or forcing the command line to elevate privileges Feb 2, 2015 · The "echo 300" is executed using sudo, which outputs 300 to stdout in the normal way. For commands or scripts that need root access: sudo . 04 (Lucid Lynx) to Ubuntu 12. SE question here which explains this and Jun 7, 2024 · On my (24. To avoid the error, the following two formulations might work : sudo sh -c "echo $(which xonsh) >> /etc/shells" echo $(which xonsh) | sudo tee -a /etc/shells By default as I recall serial ports on Ubuntu belong to the "dialout" group. How are you trying to mount it when you get the permission-denied error? If you're doing it from a command line, please provide command & error-message-output. To be more specific, I use a echo "ciao" | sudo tee /path/to/filehas one advantage: the program that outputs data is run as normal user, so it's safer in the general case where the program is not a simple "echo". Just make your user a member of the dialup group (usermod -a -G dialup <username>), log out and log back in, and you should be able to access serial devices without requiring elevated privileges. In general: To do the work of echo some-text > some-file as root, run: echo Mar 20, 2019 · Providing more details may help us to help you. That is, it tries to open the file as the current user and THEN executes sudo with the file open for standard out. internal" >> /etc/hosts' The way you written it, you will try to append the output of sudo to /etc/hosts before the sudo becomes active. (0644 translates to "u=rw,go=r", which only gives write permissions to the owner, which defaults to root. I'm using Ubuntu 18. I was comparing apples with oranges. echo 3 | sudo tee /proc/sys/vm/drop_caches Use tee --help to list more options. 04, you might encounter a "permission denied" error when running Docker commands without sudo. #3) With great power comes great responsibility. When my code get into that line it appears the Permission Denied message, this is what I have: I want to do: echo "something" >> /etc/config_file But, since only the root user has write permission to this file, I can't do that. Oct 26, 2020 · First off, the sudo is needed for the newusers command and not the echo command. Jul 23, 2025 · For example, if you encounter "Permission Denied" while reading a file, you can use sudo cat filename to read the file with superuser permissions. 13 You can use echo piped to sudo tee to allow the proper permission needed when you need to echo as root. Let’s say the user kent has been granted the sudo privilege. Why can't I use sudo echo? Sep 28, 2016 · The sudo applies only to the command (cat) not to opening the file via the redirection operator. This is because we execute the echo command and redirect the output as the kent user, but the user kent has no write permission on the file /opt/output. x thing?). com" >> /etc/ hosts bash: /etc/hosts: Permission denied Apr 26, 2016 · The best you could probably do is store your password inside a plain file and heavily restrict access to it with permissions. The same thing happens when you type ls or cat or 17 But it says permission is denied! It probably says so because you set restrictive permissions when calling create_proc_entry(). But the following also doesn't work. Just use sudo drop-caches and because /usr/local/bin is already in the system's search path it will find the command automatically. 04 and Ubuntu 14. 76. sh) or give the user rights to write/change testCase. Mar 12, 2021 · I am writing a simple bash script to download files from a remote folder, but it has to be executed as root. Dec 5, 2020 · I have a script called clearcache. Now then Suddenly I'm running into permission problems when I issue commands as root via sudo. Apr 1, 2021 · You'll need to complete a few actions and gain 15 reputation points before being able to upvote. Nov 14, 2021 · How to redirect 'something' with `sudo echo` to a file without getting the "permission denied" error. com Aug 28, 2024 · Conclusion "Permission Denied" errors in Linux can be frustrating, but understanding how to manage user permissions, ownership, and access rights effectively is key to resolving these issues. Upvoting indicates when questions and answers are useful. Your command does not work because the redirection is performed by your shell which does not have the permission to write to /root/test. e. It usually boils down to these three things: #1) Respect the privacy of others. 0. ip_forward = 1" >> /etc/sysctl. Which means sudo is no longer applied to that new process. githubusercontent. txt fails with: bash: /file. However: It is unusual to see that /dev/ttyS0 is a symlink to a pty device; this may impact permissions; if that ls output is Feb 7, 2016 · But when I used sudo echo 128M > /sys/block/zram0/disksize to change the zram size like in the document I always get bash: /sys/block/zram0/disksize: permission denied Even when I turned it off with sudo swapoff /dev/zram0 then changed I still got permission denied So how can I change the zram size? I first noticed that when I would $ sudo echo 10 > brightness I would get permission denied. Dec 3, 2018 · sudo . But we are being denied to do so. You can add yourself to this group by running something like the following: sudo gpasswd --add jodes dialout You may need to log out and log back in before this takes effect, but after doing so you should be able to read and write from and to your serial ports including USB to serial converters. In the example below, the file " Jul 3, 2020 · i want to remove the ram cache but getting permission denied error on ubuntu 18. The crontab is configured directly by my root user. ipv4. dat Arch The quotes group two commands (an echo followed by an >>) into one. password After that you can use the -S parameter for sudo to read the password from an external file like this. When I try to try to edit some files it requires root privileges. The correct way to do this would be echo "<text>" | sudo tee -a <file>. Nov 18, 2013 · It is beacuse > is not a paramter to echo it tells your shell (bash) to re-route the standard out. But simply prepending sudo to your echo command won't work, because then only echo will run as root, but the shell that writes to the file will still run as your user. echo 'testline' | sudo tee -a /etc/test/test > /dev/null Jan 1, 2024 · If you're on Ubuntu, serial devices are owned by the dialout group. Past 2012 and 2014 answers for other "permission denied" questions didn't help. I have expanded the HD from 40 GB to 60 GB. You are getting that message of cannot lock because sudo is not passed from the echo command to the newusers command. bashrc" occurs when you try to execute the `~/. This worked. sudo -S bash -c 'echo "some text" > /etc/test' <~/. Feb 19, 2019 · The redirection is processed by the shell prior to running sudo, rather than being part of it. txt But using sudo Jun 17, 2024 · To access and make changes to the “Hosts” file located at “/etc/hosts” in Ubuntu, you require root user or sudo privileges. Try running the script with sudo, like so: sudo . The command sudo echo disk > /sys/power/state simply returns bash: /sys/power/state: Permission denied. Jul 22, 2022 · Using sudo with redirection (>) or pipe (|), bash output with permission denied error message, show you different ways to fix that problem. Mar 18, 2020 · A bunch of examples that are no help at all. 这是因为 重定向 符号 “>” 是 bash 的操作符,指示bash将stdout 重定向到后面的文件。 Mar 23, 2021 · 在Linux中，使用`sudo echo`命令尝试修改`/etc/profile`时可能会遇到权限不足的问题。 原因是`sudo`仅赋予echo命令权限，而非重定向操作。 10 I'm creating a bash script to set up an Ubuntu 16. Is it possible to do commands inside containers without 'sudo'? Sep 22, 2025 · Resolve "Permission Denied" errors in bash scripts. As mentioned Jul 9, 2014 · So there's no way to issue a sudo save while editing the document? i. sudo(“bash -c ‘cd /path/; cp file. conf file but using the echo command in my shell script. sh This command will I am trying to clear the cache on my laptop running: Operating System: Ubuntu 20. Since you don't have permissions to write to the file, the redirection fails. Technically, you don't need to read the contents in order to implement the linked solution - only to write a new value. list I have an install of Ubuntu 20. A site name Jun 24, 2024 · I'm getting permission denied on crontab with any command I run and I don't know why. This could be greatly frowned upon, but the following works for me: $ sudoedit /etc/hostname We trust you have received the usual lecture from the local System Administrator. %p" > /proc/sys/kernel/core_pattern, you're trying to write as a non-root user: sudo runs echo as root, but the redirection happens in the shell from which sudo is executed, and that shell has no elevated privileges. Trying to change the keyboard backlight settings on my laptop gives me this output; even with sudo I can't change anything Jan 8, 2025 · The Docker "permission denied" error happens when you're not using sudo, or don't belong to the "docker" group. /script. sudo echo test >> /etc/hosts -bash: /etc/hosts: Permission denied $ sudo echo test > /etc/hosts Password: $ OS is up to date. txt in a given directory. I believe I got mixed but because if one runs the command in a bash script called with sudo, then it executes fine, however, pasting the command into the CLI, it results in permission denied. sudo gedit /usr/local/lib. Mar 1, 2025 · When setting up Docker on Ubuntu 24. sudo only affects the 'next' command (in this case the echo) so the append command is run as your regular user which doesn't have permission to change the file. 04. Sep 22, 2024 · Ok but how is it that I could run EnvironmentSetup. txt -bash: f. @bfontaine actually, it is behaving as expected. 04 (Precise Pangolin), I am unable to access the device connected in /ttyUSB0 if I don't have root access. I am using Ubuntu Linux and am new to Linux. password You've probably discovered by now that there are many ways to do this. 要は sudoはechoにのみ有効でリダイレクト処理としては元のコマンド実行ユーザ の権限でファイルが作成されていまいます。 Apr 15, 2025 · Once you've successfully restored your sudo command functionality, it's good practice to regularly verify user permissions and system paths to prevent similar issues in the future. Feb 28, 2024 · I want to run something with root privileges without making a user an admin/granting them sudo-ing power (effectively making them an admin). Ordinarily the program you run gets exec() ed after the redirection. Closed 13 years ago. I have written a bash script which will modify the file. UPDATE As some have correctly pointed out, this behaviour is consistent across Ubuntu 12. Aug 7, 2017 · But when i go to the container: docker exec -it img /bin/bash and then mkdir newfolder2 I get Permission denied and it requires 'sudo' command. $ sudo cat > list bash: l: Permission denied If you get permission denied error, then you need to follow the steps mentioned below to fix it. You'll need to complete a few actions and gain 15 reputation points before being able to upvote. txt: Permission denied 乙： 分析： bash 拒绝这么做，说是权限不够. / prefix in front of script. I'm trying to add a config file to /etc/sudoers. 04 Question Jan 25, 2018 · The default permissions of /etc/profile are -rw-r--r-- 1 root root 575 Okt 22 2015 /etc/profile This means that the file is readable with commands like cat /etc/profile but not executable like /etc/profile as you tried to do (executing it). Your original command failed, as the IO redirection with >> will be done as the regular user, only your echo was executed with sudo. However, executing the same command with sudo gives also permission denied error! It seems that output redirect > does not inherit the permissions of the preceding command echo. 3 Lts 64-bit Asked 4 years, 7 months ago Modified 4 years, 7 months ago Viewed 2k times Dec 9, 2021 · sudoでリダイレクトするとPermission deniedとなってしまったsudoを実行しているユーザの権限が無いファイルにリダイレクトで書き込みをしたところPermission deniedとなってしまったので、その原因と解決方法を調 Feb 4, 2013 · I tried typing-sudo echo 0 > /proc/sys/kernel/yama/ptrace_scope" in terminal, but the terminal replied-Permission denied! I really Couldn't get the last suggestion. Apr 2, 2015 · sudo from a standard user works fine, but when I try to use it from root it returns this error: sudo: can't open /etc/sudoers: Permission denied sudo: no valid sudoers sources found, quitting /etc/ Apr 27, 2021 · The shell interprets the >> within the current user prior to executing the sudo. Jun 5, 2016 · I tried to run echo 1 > /proc/sys/net/ipv4/ip_forward It says Access denied from bash, I then did: sudo chmod 1+x /proc/sys/net/ipv4/ip_forward and now it says Operation not permitted. list The tee command is called as the superuser via sudo and the -a argument tells tee to append to the file instead of overwriting it. like vi's :wq! ? So if you've spent a while editing a document without realising it's protected, there's no way to save it?. ) echo "my edit" | sudo tee -a /etc/bash. 0 BY-SA版权协议，转载请附上原文出处链接及本声明。 Aug 31, 2025 · 文章浏览阅读5. Then the result is passed by the shell (not by echo) to a new command of /sys/class/gpio/export, which because it is a new command it isn't executed with elevated privileges. 04 Permission denied despite running sudo chmod -R 755 storage bootstrap/cache on Ubuntu 20. Nov 22, 2019 · Also as a side note when attempting to run the command sudo /var/www/db_backup. 4. igttmj uaexc ekri hij johx dywo szgk zdvx rgul jbvxrvh ftkmx pzst mbbfmday diauf koue