ls -al

확인 방법 $ which watch /usr/bin/watch 사용법 $ watch --help Usage: watch [options] command Options: -b --beep beep if command has a non-zero exit -c --color interpret ANSI color and style sequences -d --differences[=] highlight changes between updates -e --errexit exit if command has a non-zero exit -g --chgexit exit when output from command changes -n --interval seconds to wait between updates -p --p..