aproposコマンド（manページの検索）

$ apropos kill
kill                 (1)  - terminate a process
kill [builtins]      (1)  - bash built-in commands, see bash(1)
killall              (1)  - kill processes by name
killall5             (8)  -- send a signal to all processes
pkill [pgrep]        (1)  - look up or signal processes based on name and other attributes
skill                (1)  - send a signal or report process status
snice [skill]        (1)  - send a signal or report process status
yes                  (1)  - output a string repeatedly until killed