watch [man page] - execute a program periodically, showing output fullscreen


watch [-dhvt] [-n seconds] [--differences[=cumulative]]
      [--help] [--interval=seconds] [--no-title]
      [--version] command 

Frequently used options

-n seconds interval in seconds 


Watch is utility which helps you to WATCH for changes. For example if we want to watch content of directory for new files we can do:

$ watch ls ~/ 

By default watch update screen every 2 seconds. To change this interval we can use -n option. If we want to watch to refresh screen every 0.5 second we do:

watch -n 0.5 ls ~/ 

watch for directory or file change

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