File permissions

sabarishsubramanian · 02-01-2012, 08:04 AM

Hi everybody.Can someone tell how to set the file permission for a particular user in linux???

edgardl · 02-01-2012, 08:36 AM

Hi

You could use chmod command, depending of the kind of permission you need, for example

$chmod a+x file

this would set execute permission for all, however you can change "a" by u (owner), g (group)or o (others)
Furthermore we have r (read), w (write) or x (execute)

You should take a look at man chmod

eleljrk · 02-01-2012, 08:49 AM

chown or chmod are the commands you seek. Try -?, -h or --help for more information.

sundialsvcs · 02-01-2012, 08:40 PM

Many filesystems support access control lists (ACLs), which, when they are used, effectively supersede the traditional -rwxrwxrwx permissions mask. However, they are not entirely standardized as to their format or their capability. You might be able to get some good out of PAM, but I am truly not knowledgeable on this point.

sabarishsubramanian · 02-02-2012, 10:12 AM

hi everybody i need to set the permission for a particular user with their id

chrism01 · 02-03-2012, 12:04 AM

As you were told, look into chown http://linux.die.net/man/1/chown & chmod http://linux.die.net/man/1/chmod.
Taking you literally ie perms not ownerships, then chmod is the one.

devilboy09 · 02-04-2012, 06:26 AM

Quote:

Originally Posted by sabarishsubramanian

hi everybody i need to set the permission for a particular user with their id

i think you mean a permission like a user can install programs or issue the particular commands.in this case you should user sudo.
its file is located in /etc/sudoers.there's good comment in that file.if you didn't understand the syntax, do tell.

lwasserm · 02-04-2012, 07:20 AM

as already noted, chown will set the permissions of an existing file. Perhaps you mean to set the file permissions used by default when a user creates a file. If so, bash and probably most other shells have a "umask" builtin command, and it can also be used in your .bashrc file.