Sysadmin
varnish
Linux Tutorial - Managing Group Access on Linux and UNIX
Set file, directory and device permissions: File, directory and device permissions can be set to allow or deny access to members of their own group or all others. Modification of file, directory and device access is achieved with the chmod command.
It may or may not surprise you to know that the bash shell has a very rich array of convenient shortcuts that can make your life, working with the command line, a whole lot easier. This ability to edit the command line using shortcuts is provided by the GNU Readline library . This library is used by many other *nix application besides bash , so learning some of these shortcuts will not only allow you to zip around bash commands with absurd ease :), but can also make you more proficient in using a variety of other *nix applications that use Readline. I don’t want to get into Readline too deeply so I’ll just mention one more thing.
Bash Shortcuts For Maximum Productivity
SSH
nginx