Linux command: pidof

pidof - find the process ID (PID) of a running program [using its name].

Kill openvpn process

root@T420:~# pidof openvpn
41
root@T420:~# kill -15 $(pidof openvpn)

nmap - The Network Mapper

WARNING : It is ILLEGAL to scan hosts without permission.

Linux command: xargs

xargs - build and execute command lines from standard input

command1 ; command2 ; command3 command1 is executed, then command2, and then command3 command1 && command2 && command3 command2 is executed only if command1 run successfully (exit code is 0), command3 is executed only if command2 run successfully (exit code is 0) command1 || command2 || command3 command2 is executed only if command1 exit code is 0 (failure), command3 is executed only if command2 exit code is 0 (failure)

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