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Distribution: Currently Suse 11.1 but have RH7,8,9 / Fedora 7,8_64,9_64,&10_64
I think it works like this
chmod perm filename
(=change mode) Change the file access permission for the files you own (unless you are root in which case you can change any file). You can make a file accessible in three modes: read (r), write (w), execute (x) to three classes of users: owner (u), members of the group which owns the file (g), others on the system (o). Check the current access permissions using:
ls -l filename
If the file is accessible to all users in all modes it will show:
The first triplet shows the file permission for the owner of the file, the second for the group that owns the file, and the third for others ("the rest of the world"). A "no" permission is shown as "-".
When setting permissions, these symbols are used: "u"(=user or owner of the file), "g"(=group that owns the file), "o"(=others), "a" (=all, i.e., owner, group and others), "="(=set the permission to), "+"(=add the permission), "-"(=take away the permission), "r"(=permission to read the file), "w"=(write permission, meanning the permission to modify the file), "x"(=permission to execute the file).
For example, this command will add the permission to read the file junk to all (=user+group+others):
chmod a+r junk
This command will remove the permission to execute the file junk from others:
chmod o-x junk
You have to install the sudo package. If unsure whether it's installed, type sudo at the prompt and see if you get a "command not found" response. Once it's installed you have to edit the /etc/sudoers file and add the appropriate user to the file. There should be a root entry already and man sudo or man sudoers will have more info.