watch -n <seconds> <command>

bash function to check for something every 5 seconds

Every seconds do
Sample Output
Every 10,0s: ls /tmp                           Fri Sep  4 19:19:11 2009
...
<list of files>

-1
By: aonick
2009-09-04 15:19:42

1 Alternatives + Submit Alt

  • checkfor: have the shell check anything you're waiting for. 'while : ; do' is an infinite loop '$*' executes the command passed in 'sleep 5' - change for your tastes, sleep for 5 seconds bash, ksh, likely sh, maybe zsh Ctrl-c to break the loop Show Sample Output


    1
    function checkfor () { while :; do $*; sleep 5; done; }
    relay · 2009-09-03 19:35:42 1

What Others Think

watch is not part of bash, it is a program that in debian/ubuntu comes with the 'procps' package. Bash can tell you if certain commands are builtin. Run this from within bash: type watch watch is /usr/bin/watch or this: type type type is a shell builtin
bwoodacre · 454 weeks and 6 days ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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