find . -name “*.sty”

lsof | less : list open files, more information with fuser

rpm -qil –whatprovides –provides php

dpkg -L paketname : list files installed by paketname; more see AptDpkg

id : gives not only username but uid+guids

uname -a : gives all system informations like hardware,software

less file.txt : pressing v in less mode enters vi

ssh-keygen -l -f /etc/ssh/ssh_host_rsa_key.pub : gives fingerprint of my system written into ~/.ssh/known_hosts

typing CRTL+A jumps to the beginning of the shell line

visudo : change /etc/sudoers

echo $PATH : ask values of variable PATH