If you leave out the a, chmod assumes you mean “all”. In other words, commands like chmod a+r myfile and chmod +r myfile do the same thing. If you specify u, you can change permissions just for the owner (u is for “user”, ...
... display two files together $ cd Change to specified cd /usr/bin $ caparanoia * # Wodim * # Cfdisk * # chgrp $ chmod $ chown directory Convert CD audio tracks to hard disk files Burn audio or CD-R/RW data discs (the latter usually ...
This book also supplies a series of comprehensive tutorials on Ubuntu administration and security—essential for any Ubuntu user—while not neglecting matters pertaining to office applications and the cloud.
This sixth edition of Beginning Ubuntu Linux introduces all of us—newbies, power users and system administrators—to the Natty Narwhal Ubuntu release.
Beginning Ubuntu Linux: From Novice to Professional, Third Edition is the update to the best-selling first book introducing Ubuntu Linux.