Questions tagged [chmod]

chmod is used to change the commonly used read, write, and execute permissions on files. It can change these permission bits for the file owner, the file's group owner, and everyone else. It can also change the more esoteric ‘permissions’ (attributes, reall) like set-user-ID, set-group-ID, and sticky bits.

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How can I change the permissions on a usb flash drive?

My sd card in my usb card reader will not allow me to add files while in ext4. I checked permissions and it's in root. I'm hoping if I change the permissions to non-root, it will let me add files. ...
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Accidentally ran `chmod -R 755 *`. Is the situation desperate?

[Edit: See full list of commands I ran at the bottom.] I accidentally ran chmod +x * inside ~/.config which contained two .sh file that I wanted to make executable. There is no prompt for password ...
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Locking down image files in folders

I have a form which uploads a picture to an upload folder on my Gnu/Linux host. When the user registers, it creates a folder for them, in uploads, and puts their picture into it. I have disabled ...
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Set default permissions for new files and folders

I have an upload directory which has information fed into it by users, each time a user registers they submit a picture which creates a folder for them in the upload directory and stores their photo(s)...
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1answer
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How to write to file with redirection/pipes if it's read-only

So this seems to work: chmod 777 config.json node declarations.js > config.json chmod 444 config.json but that seems like extra steps. is there some way to write to a file with redirection and ...
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Can not access to sudo [duplicate]

I ran the command: sudo chmod -R 777 / And now I have that: sudo: /usr/bin/sudo must be owned by uid 0 and have the setuid bit set Thank you for help!
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How to change permissions of all the files in my directory?

I used a script to install Hadoop /opt/hadoop-3.2.0$ ll total 216 drwxr-xr-x 10 yarn hadoop 4096 јул 9 08:05 ./ drwxr-xr-x 9 root root 4096 јул 9 07:42 ../ drwxr-xr-x 2 yarn hadoop 4096 ...
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2answers
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Can't create directory in directory owned by group

I have a group called homeperms on an Ubuntu system, with a few users: $ cat /etc/group | grep "homeperms" homeperms:x:1004:jorik,tim.wijma,vanveenjorik,jorik_c And I've done $ sudo chgrp -R ...
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Cannot change file/folder permission on Linux running on VMware

I am using Linux on a VMware on Windows and added a second HDD device today. However, each file or any dictionary that is created on the new device gets executable permissions which are not removable (...
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SetGID on folder with Active Directory users

I have a directory which staff are allowed to sftp into on an Ubuntu 18.04 server. The directory is root:www-data owned (it's a web server) and I've set chmod +t and chmod g+s so data cannot be ...
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Chromeos Linux Beta

I am attempting to install Krita on my chromebook. I have 'turned on' linux beta and chromeos prompts me that 'Shared folders are available in Linux at /mnt/chromeos...' Issue debian@penguin:/mnt/...
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How do I change permissions for only the folder and no subfolders or files contained therein?

I need to change permissions for a root folder, then change them straight back. All permissions for everything else should stay the same. So, I need to find out current permissions change them to ...
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Set File Permissions to Default from Umask

https://geek-university.com/linux/set-the-default-permissions-for-newly-created-files/ So I want my umask (command) which in this case is 0002 to be subtracted (bitwise) from 666 for files and 777 ...
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Why can I change permissions for a file with 000 permissions? [duplicate]

I have the following file: ------- 1 user user 0 may 26 14:07 a.tar.gz When I execute chmod 777 a.tar.gz, the file permissions change. Why does this happen, and how can I block it?
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Permission setup for two different groups of users in the same directory

I need to find the optimal permissions layout for the following use case: There is a AIX machine used for collaborating on software projects. Each project has its own sub-directory. For each project,...
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How to change file permission of shell files

I have a directory where a lot of bash scripts or .sh files exist. I want to change their permissions to 770 (rwxrwx---) with the chmod command. How can I accomplish that?
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Can't read directory from owner with 700 permissions [duplicate]

I have directory with rwx permission for current user, but he's unable to access it, why? : sudo ls /usr/data/user-data -lad drwx------ 9 andrew andrew 4096 May 17 11:13 /usr/data/user-data : ...
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What does @ symbol mean in file permission? [duplicate]

I started encountering the following problem when I was trying to delete a set of files when I started seeing the following error on my MAC with macOs, Mojave. "The operation can’t be completed ...
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1answer
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Can't open file even though directory/file is owned by user and in group

I am having a really tough time understand user/group permissions. I have spent hours reading and trying things. Here is what I have: Directories Permissions Input 1: ls -lhd Output 1: /var/log: ...
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2answers
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All files or folders copied from an NTFS drive are with drwxrwxrwx rights. Can I correct this easily?

I went from Windows 7 to Debian 9, copying most of the files I'm using for my projects from an NTFS drive. I see that : all the folders I have copied are now with rights drwxrwxrwx instead of drwxr-...
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Bash script returns permission denied message

When I run this script: #!/bin/bash # internet-status.sh # ================== now=$(date +%F) cmd_output=$(nc -dzvw1 8.8.8.8 443 2>&1) logfile_string=$("[$now] $cmd_output") logfile=$("$HOME/...
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stop force save on a file with read only permission

I have a script file that is currently in sudoers, and for security I want this file to be read only... so I issued the following chmod: chmod 555 test.sh Now the permissions on this file are -r-xr-...
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Website cannot write to files or create directories

I've been trying to install TeemIP for about 6+ months now and I've never been able to figure out this issue on Centos7. The error I get is the following: The directory '/var/www/teemip/public_html/...
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What does chmod -u do?

By accident I ran chmod -u filename and it removed all of the permissions I had on filename. The man page does not reference a -u option. Experimenting I was able to conclude that it removes not all ...
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Does Access Control lists override group or owner permissions?

I came across the following task: Add 3 new users - alice, bob, charles Create a new group - marketing - and add alice, bob and charles to that group Create a directory - /marketing - whose owner ...
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Can't remove a file with file mode bits a+rw

I have a file with the following file mode bits (a+rw): [0] mypc<johndoe>:~>sudo touch /tmp/test [0] mypc<johndoe>:~>sudo chmod a+rw /tmp/test [0] mypc<johndoe>:~>ls -l ...
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1answer
66 views

chmod without changing stat (atime) of file

i would like to be able to chmod a directory structure without changing the atime of those (files and) directories. if i start out with a file structure like $ tree test/ test/ ├── test1.txt └── ...
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1answer
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Can only write as root although user seems to have full permissions [duplicate]

I am having trouble writing to a samba share from a linux client (a Windows client can read and write just fine). According to ls -la run from the linux client, I should have full permissions: james@...
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2answers
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sudo never works. I have no permissions on my computer [closed]

I want to reinstall Linux Mint..... Many commands start with sudo and then apt-get or whatever. I am never able to get past this. Typical attempt: john@john-AY022AA-ABA-p6330f:~$ sudo apt-get ...
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What happens if I change chmod permissions to rrr [closed]

I want to try to change /bin/chmod permissions file to rrr but afraid to loose my machine. What happens next if I change them?
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nosuid doesn't prevent chmod u+s

I follow a tutorial to secure my /etc/fstab file. This is a certain part about /var and /tmp UUID=XXXX-XXXX-XXXX /var ext4 defaults,nodev,nosuid,noexec 1 2 UUID=ZZZZ-ZZZZ-ZZZZ /tmp ext4 defaults,...
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2answers
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Use chmod command selectively

I want to set 755 permission on all files and sub-directories under a specific directory, but I want to execute chmod 755 only for those components which does not have 755 permission. find /...
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1answer
329 views

Man page for file permission numbers

Is there a man page for the file permission numbers? I'm specifically talking about r = 4 w = 2 x = 1 I can never remember them and I have to google it every time I need to set permissions besides ...
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1answer
626 views

Why is /tmp mounted with permissions 0755 when fstab has 1777?

For /tmp in /etc/fstab, I have mode=1777, but after a reboot, the permissions on /tmp are 0755. Another directory /var/tmp is configured in exactly the same way but does not have this problem (see ...
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2answers
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ls -I myExecutable is listing the rest of the dir files instead of showing info about the file

Working on Raspian, after compiling using make, I do a ls -I myFile in order to see the permissions of the file and if it is marked as executable as it should and instead of getting something like ...
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What happens if we, recursively, change folder permissions after changing files in it?

What will these below commands actually do? chmod 777 /yoda/htdocs/cups/logs/* chmod -R -f 777 /yoda/htdocs/cups/logs/ When I check the file permissions in ..../logs folder, they are showing as -...
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1answer
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chmod all files in a directory [duplicate]

How do I change all files (different types including .sh, .py, and other executable files) in a known directory to permission 775 without listing all of the file names? I mean "all" of them in that ...
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1answer
49 views

Solaris difference between 's' and 'l' in permissions

On a Solaris 11 machine, when I execute chmod 2000 myfile, I get l instead of S or s: touch myfile && chmod 2000 myfile && ls -l myfile ------l---. 1 pydoge pydoge 0 Oct 16 12:35 ...
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2answers
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Using octal method,how do I type the exact command I would use to make test.txt have the following permissions dr-xr-x— [duplicate]

Using octal method,type the exact command you would use to make test.txt have the following permissions dr-xr-x---
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1answer
846 views

can not set user write permissions to file in SMB mounted directory [duplicate]

I have mounted a Windows 10 directory so I can edit some files on my Windownz machine. sudo mount -t cifds //W10/Users ~/public/ -o username=bobby When checking the directories they all have the ...
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Permissions denied on files despite 777 mode

I am getting a permission denied error on CentOS 6.10 64 bit Kindly note that the "#" indicates a Root Level User prompt. # cd /tmp # chmod 777 file* # /bin/ls -l file* -rwxrwxrwx 1 apache apache ...
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Removing and adding permission using numerical notation on the same line

I'm having some trouble trying to remove write permission from the owning group (g), and to add read permission to others (o) at the same time. How would I remove some permission from the owning ...
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1answer
56 views

Can't access folder with group permissions

It seems that I can't access a folder on which I put 777 group permissions, even though I am a member of the folder's group. Error detail : 10:57 ~ $ ls -l d---rwx--- 2 laurent www-data 4096 août ...
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why while loop works from terminal if ld-2.17.so have no executable permission?

In my previous question, executed "chmod 666 ld-2.17.so" - how can i recover? I asked if I change ld-2.17.so permission to read, how can I recover it back, since it won't allow me to execute ...
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why doesn't setfacl give executable permission?

I ran sudo setfacl -d -m g::rwx /tmp then went into /tmp and created a file and looked at its permissions: -rw-rw-rw-. 1 jm wheel 0 Aug 24 10:26 test_file then I ran sudo chmod g+rwx ...
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1answer
202 views

Change File Permission at run time

I have two users in a group. Users: 1) apache 2) data Group 1) apache I have three directories. The directory structure of that three directories are like below. drwxrwx--- 10 data ...
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1answer
241 views

How to add sticky bit to a directory in exFAT?

I get this error from Homebrew when trying to build an application on MacOS 10.10.5, on an exFAT filesystem Error: parent directory is world writable but not sticky I use this command to enable ...
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1answer
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Can chmod on a directory without --recursive change who can read a file within that directory? [duplicate]

Based on the suggested duplicate, let me reformulate my question: If chmod 0660 path/to/folder is run, and user A isn't in the relevant group, could user A still read /path/to/folder/file.txt if that ...
2
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1answer
147 views

How to check if there are “other” permissions in home directories

Right now, I have a script that runs daily that chmod's the home directories, removing all "other" permissions from the directories and the "group" write permission. See below. #Removing all other ...
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1answer
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Permissions Based on Lowest Level

My user account, samjaques, belongs to a group sams. I have two folders, both in the sams group. Folder 1 is owned by root, Folder 2 by samjaques. Both have permissions set as ---rwx---. From the ...