#linux

Gnu-Linux

→ Make user change password next connection

chage -d 0 the_user

→ Search in the history of command

• ctrl+r: reverse search within the history
• ctrl+s: search in the history (add stty -ixon in the .bashrc)

→ sync two folders realtime

• lsyncd in direct mode leverages inotify and basic cp/MV/rm commands, batching file modification
• In Debian

→ show diff on two files

• comm

comm -23 <(sort a.txt) <(sort b.txt)