RH033读书笔记(4)-Lab 5 File Permissions

Lab 5 File Permissions

Sequence 1: Determining File Permissions

1. What is the symbolic representation
644 rw-r--r--
755 rwxr-xr-x
000 ---------
711 rwx--x--x
700 rwx------
777 rwxrwxrwx
555 r-xr-xr-x
111 --x--x--x
600 rw-------
731 rwx-wx--x

2. Given a file with permissions 755, what commands would change the permissions to r-xr--
r--?
rwxr-xr-x
chmod 544 filename
chmod u-w,go-x filename
chmod u=rx,go=r filename

3. execute downloaded a file.
chmod +x cmdname
chmod 755 cmdname

4. How could root change the ownership of a file so that it is associated with the user joe
and the group apache?
chown joe filename ; chgrp apache filename
chown joe:apache filename