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 ...

learn more… | top users | synonyms

2
votes
2answers
37 views

Lock A Built-in Application?

I know I am able to lock an application using: sudo chmod a-x /Applications/'Application'.app but I encountered a problem while trying to lock an application, like safari, which is built in. ...
0
votes
2answers
196 views

How to recursively change permissions on all directories inside current directory?

How can I change folder and file permissions for all files and folders recursively inside current directory? I am not sure, why, but my command fails with this output: chmod: missing operand after '...
2
votes
2answers
484 views

Permanently change permissions of /var/run/postgresql

On Linux Mint 17.0 Cinnamon Edition, I want to use /var/run/postgresql as the unix_socket_directories option for all of my postgres databases. Whenever I run the command pg_ctl -D postgres-data -o '-...
0
votes
0answers
33 views

What is the effect of rsync with -E and --chmod?

Reading through a script I came across an rsync command with the following flags: -rtlDE -c --delete-after --chmod=u+rwX,go-rwx /path/to/dir1/ /path/to/dir2/ Background: I am refactoring the ...
3
votes
1answer
11k views

I can't seem to remove a file even after changing ownership and permissions [duplicate]

Haven't been here much. Mostly Stackoverflow. Anyway, I have a file that I can't remove. I tried sudo rm files.db and got Operation not permitted Did sudo chown me: files.db Then sudo chmod 777 ...
3
votes
2answers
644 views

reset permissions back to default

How can I reset permission to default according to the mask, so they will have permissions set as the file was just created Example of what I want to achieve: umask is set to 0022 so touch file ...
3
votes
2answers
68 views

Changing file permissions according to their names

I created 512 files, with names made from combinations of permisions (r, w, x). I created them like this: touch ./{r,-}{w,-}{x,-}{r,-}{w,-}{x,-}{r,-}{w,-}{x,-} and I want the files to have same ...
12
votes
3answers
8k views

chmod + silent mode + how force exit code 0 in spite of error

Is it possible execute chmod and ignore error from command Example ( remark file.txt not exsist to show the example ) When I type chmod 777 file.txt I get error on the output chmod: cannot ...
0
votes
0answers
22 views

How to give write access for overlay fs?

Should i change rights on mount point, or workdir or both? Should i use commands (to give write access for all users) find . -type d -xprint0 | xargs -0 chmod 777 find . -type f -xprint0 | xargs -0 ...
2
votes
2answers
13k views

assigning read/write privileges for a folder to a user in CentOS 7

I am logged into a CentOS 7 server as root. I created a folder /somefolder. I want someusername to be able to write to that folder via scp from a remote computer. What command should I run so that ...
0
votes
1answer
7k views

What does “execute” permission on a folder means? [duplicate]

I have read this topic, which gave me some info but I feel I am not fully getting it. What does the execute permission actually means on a folder? I fully understand what it means on a file, but on a ...
22
votes
7answers
14k views

Is there a web based converter between rwx and the octal version?

I can never remember what the conversion is from something like rw-r--r-- to 644. Is there a simple web based converter between the 2?
1
vote
2answers
509 views

File Permissions Sticky&User Execution

After the website of a client has been hacked, I found some files with the following permissions set What exactly S and T stands for? Also, which one is the command to set them with those ...
2
votes
1answer
60 views

vsftp doesn't respect chmod setting when uploading outside my local network

Yo! I've a ftp server on my linux machine and I've set the following rules: I keep group and owner and chmod it to 775. When I use it at home (192.168.x.x) it's ok, files keep their group and user ...
1
vote
1answer
232 views

Linux Copy user's permission to another user

The server is centos, the user is named dev_admin. Now I added a new user ops_admin and I want to copy dev_admin's permission to ops_admin. I tried the following command as root: useradd ops_admin ...
-1
votes
1answer
38 views

Unix directory for all users permissions

I'm trying to make a directory where all users can write, but no user can delete another users file in that directory.
0
votes
1answer
186 views

How to convert text into numbers for chmod? [duplicate]

I need to chmod something into drwxrwx---. What is drwxrwx--- in number form?
2
votes
1answer
81 views

Is it a good idea to set file permissions to 640 on windows partition?

I run both Arch Linux and Windows 10 on my computer. When I cd onto the Windows partition (which uses NTFS), I notice that all files and folders have 777 file permissions. I want to run $ chmod 640 -R ...
0
votes
1answer
94 views

How do I modify contents of a directory without sudo?

I'm trying to modify the contents of a directory using git. Problem is if I use sudo it nullifies my ssh forwardAgent. I'm not the owner of the directory but I am part of it's group. If I chmod 775 ...
0
votes
1answer
44 views

Dandelion List Listener Fails

I am trying to use lisp in linux but I can not get the listener to work. Using Eclipse's menu, in help -> install new software, I installed the dandelion plugin but every time I try to run lisp code, ...
5
votes
1answer
3k views

Why does setuid not work? [duplicate]

I want to ensure that my program can only be run by user xyz using root privilege. To do this, I set the setuid bit with: chmod u+s program1.sh ls -l program1.sh rwsr-x--- 1 root house 1299 May 15 23:...
7
votes
4answers
27k views

Change permissions for a symbolic link

I have a symlink with these permissions: lrwxrwxrwx 1 myuser myuser 38 Aug 18 00:36 npm -> ../lib/node_modules/npm/bin/npm-cli.js* The symlink is located in a .tar.gz archive. Now when I ...
29
votes
5answers
10k views

Understanding UNIX permissions and their attributes

I've never really got how chmod worked up until today. I followed a tutorial that explained a big deal to me. For example, I've read that you've got three different permission groups: owner (u) ...
1
vote
2answers
152 views

Find all .php files inside directories with writable permissions

I'm looking for a linux command to scan through all writable directories on the server and show ones with .php and .html files inside them. Something like: find -type d -writable -exec find {} -...
0
votes
0answers
87 views

Prevent other users from reading my files

I have 2 users: Joe is root and Gary (normal user). But if Gary enters 'cat /home/joe/function.php', he can view all code with mysql password into this file. What is the solution for disabling all ...
0
votes
1answer
147 views

invalid mode chmod command

I am trying to look for all files with xyz in their filenames in my working directory and then change their permissions in symbolic mode. find . -type f -name *xyz* ; chmod -v u=a+wx {}\; I get ...
0
votes
0answers
99 views

Permissions set to 755 but I cannot access folder

I want to access some files in a folder that I created in a server. I have changed the file permissions recursively to 755, which basically should allow everyone to read and execute files, but this is ...
2
votes
1answer
172 views

chmod doesn't work on Mac

I have a very simple question. I cannot make a file executable from the command line on a Mac. This is what I'm typing in terminal cd ./Desktop echo 'say hello' > hello chmod +x hello hello It ...
6
votes
1answer
354 views

What permissions one needs to run chmod, chown command on a folder/item?

I've always been running chmod/chown commands as a sudo user. But today I wondered if I don't use sudo, what permissions do I need to actually execute chmod/chown command on a folder/file? I've tried ...
2
votes
2answers
2k views

How to hide someone else's directories from a user?

I have several folders: /home/user1/ -u user1 -G user1 /home/user2/ -u user2 -G user2 /home/user3/ -u user3 -G user3 I created three users user1, user2, user3. Each user has their own group. Any ...
0
votes
1answer
354 views

ACL contradict chmod

I have installed opencart 1.5.6.1 on Digital ocean ubuntu14.04 I have used "demo" as username and login by tightvnc opencart requird "www-data" as owner and group: $ sudo chown -R www-data:www-data /...
2
votes
1answer
106 views

What is the meaning of the mode mask names from stat(2) and chmod(2)?

The stat calls have a series of symbolic names for the various bits in the mode field. From the stat(2) manual page: The following mask values are defined for the file mode component of the st_mode ...
0
votes
2answers
160 views

chmod – execute permission for non-admins?

I have used chmod to make all the contents of a directory executable. However, when I try to run one of the programs in that directory as a regular user (me), I get a "command not found" message. If ...
1
vote
2answers
51 views

shell script for chmod file name but only on new files since last run of the script

i have a directory where new files are uploaded and receive numeric filename as they are uploaded. the file name is numbers that go up. i need to change permissions for the file but only on new files ...
2
votes
1answer
299 views

Give permissions to change permissions

I am running a script to deploy a website on a server. It gives me the following error: DEBUG [4223cc8a] Command: /usr/bin/env chmod +x /tmp/mysite_staging/git-ssh.sh DEBUG [4223cc8a] changing ...
2
votes
2answers
154 views

Is it possible to change the directory permission to its previous state?

I have accidentally changed the permission of "/usr/bin" directory and its files by the command: $chmod 775 /usr/bin -R First, there was a problem with sudo but I fixed it. Now I am suspicious that ...
0
votes
1answer
143 views

Always get Error: Operation not supported for: find /Path/ -type f -exec chmod 755 {} \;

I want to change the access permissions for MP3 files on an external 2,5" HDD on my Raspberry Pi on which I run an actual version of Raspian. To do so I tried to use the following command: find /...
1
vote
1answer
84 views

changing file premissions doesn't work

I ssh into a server, and tried changing a files permission. This is what I got: $ ll total 1 -rwx--x--x 1 <user> <groups> 17 Jul 29 12:06 index.html $ chmod 777 index.html $ echo $? 0 $ ...
-1
votes
2answers
85 views

How to make an existing directory (and sub-directories) to be suddenly writable by ROOT ONLY?

Let's say i have a directory, at: /tmp/uploads/ And inside got several recursive directories and files created by DIFFERENT USERS before. So now, suddenly how do i make that above directory to be ...
-2
votes
1answer
293 views

How to make a NON-WRITABLE directory?

Actually i'm aware of a "PHP Web Folder". There seems to be some potentials of incoming attacks. So that i want to make sure this whole directory is READ-ONLY (Only writable by ROOT). Let's say the ...
9
votes
8answers
16k views

Convert ls -l output format to chmod format

Say I have the following output from ls -l: drwxr-xr-x 2 root root 4096 Apr 7 17:21 foo How can I automatically convert this to the format used by chmod? For example: $ echo drwxr-xr-x | chmod-...
15
votes
3answers
2k views

Purpose of permissions such as 0111 or 0333

What is the purpose of Linux permissions such as 111 or 333 (i.e. the user can execute, but cannot read the file), if the ability to execute does not automatically imply the ability to read?
2
votes
2answers
4k views

How to Change Owner of a Directory

EDIT: The problem was that Apple uses permissions to mark backups and prevents you from modifying them (probably a security feature). By using chmod -RN <dir> I removed ACL data from all the ...
1
vote
3answers
1k views

Directory appears as file?

So we copied some photos in a directory across to a NTFS partition last night, and they were viewable from ubuntu. Today the directory is not accessible from Windows, and when we booted back into ...
1
vote
1answer
707 views

Meaning of chmod 1775

Created a folder "Sample_dir" and analysed its permissions. $ mkdir Sample_dir $ ll Sample_dir/ total 36 drwxrwxr-x 2 user user 4096 Jul 1 19:26 ./ drwx------ 71 user user 28672 Jul 1 19:26 ../ ...
1
vote
1answer
2k views

reliable way to give all read/write access recursively in CentOS 7

What is the most reliable way to give all users read/write privileges for a given directory and all of its subdirectories and files in CentOS 7? In an eclipse web application project that uses Maven,...
5
votes
2answers
2k views

Directory special permission problem

When I write: chmod g=rws,u=rwx,o=rx folder_name I get: drwxrwSr-x But S is not the same as s, right?
1
vote
2answers
97 views

shell or perl script to check group have read privileges

ls -l drwx------ 8 ws web 1024 Apr 29 2013 abc drwxr-xr-x 8 ws web 1024 Oct 19 2011 def I need some script to find directories like abc which doesn't have read/execute permissions ...
13
votes
3answers
130k views

Create file in folder: permission denied

I'm a newbie in the GNU/Linux-Ubuntu world. I have a problem copying files to a directory on Ubuntu 12.04. I create a directory in the home directory so that the path where I want to copy to is: /...
1
vote
1answer
283 views

Linux Root group change chmod for root owned to 770

I'd like to have normal user account assigned to root group (which I've done already) and change mod of all files that are owned by root user to 770, If I understood it well in result of that every ...