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find . -name “*.sty”
lsof | less : list open files
rpm -qil –whatprovides –provides php
dpkg -L paketname : list files installed by paketname
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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