igli 1188581229 learn If a command seems really useful, and it's not in man -k , it might we be a builtin. Try eg help exit at your terminal. igli 1188581241 forget igli 1188581249 learn If a command seems really useful, and it's not in man -k , it might well be a builtin. Try eg help exit at your terminal. lhunath 1211303548 forget lhunath 1211303613 learn Builtins are commands that are built into bash. You cannot run them from outside bash. They do not have man pages but are explained in man bash. They also have a help page: ''help [builtin-name]''