Commands by Yousri (1)

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Makes the permissions of file2 the same as file1
Also works with: $chgrp --reference file1 file2 $chown --reference file1 file2

Set file access control lists
The file myfile is owned by tom and has read and write permissions for tom. Group and other permissions are empty which make myfile readable and writable only by tom. setfacl enables user tom to give read permission to user john only. The command 'ls -l' shows a '+' sign telling us that file access control list has been setup for myfile.

list block devices
Shows all block devices in a tree with descruptions of what they are.

Automatically find and re-attach to a detached screen session
man screen: "-D -R Attach here and now. In detail this means: If a session is running, then reattach. If necessary detach and logout remotely first. If it was not running create it and notify the user. This is the author?s favorite."

check open ports without netstat or lsof

Install pip with Proxy
Installs pip packages defining a proxy

nmap get all active online ips from specific network
scan whole specific network for active online ips

Print just line 4 from a textfile
this method should be the fastest

Sort a character string
Sorts a character string, using common shell commands.

Quick access to ASCII code of a key


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