UNIX Basic commands: chmod
The chmod command changes the access mode of one file or multiple files.
Syntax
The syntax for the chmod command is:
chmod [option] mode files
Options
| Option | Description |
|---|---|
| -R | Descend directory arguments recursively while setting modes. |
| -f | Suppress error messages if command fails. |
Mode
| Mode | Description |
|---|---|
| Who | u=user, g=group, o=other, a=all (default) |
| Opcode | + means add permission - means remove permission = means assign permission and remove the permission of unspecified fields |
| Permission | r=Read, w=write, x=Execute, s=set uid bit, t=sticky bit u=user, g=group, o=other, l=mandatory locking |
Example
chmod 751 tech chmod u=rwx, g=rx, o=x tech chmod =r tech
* Please note that there are many flavors of UNIX, so if in doubt, consult your man pages.
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