16.3.2 Access permission tests

These options test for particular access permissions.

`-g file'

True if file exists and has its set-group-id bit set.

`-k file'

True if file has its sticky bit set.

`-r file'

True if file exists and is readable.

`-u file'

True if file exists and has its set-user-id bit set.

`-w file'

True if file exists and is writable.

`-x file'

True if file exists and is executable.

`-O file'

True if file exists and is owned by the current effective user id.

`-G file'

True if file exists and is owned by the current effective group id.