watch -n 1 "do foo"

repeat a command every one second

Short method of "while x=0; do foo ; sleep 1 ; done"

11
By: mesuutt
2012-07-11 13:42:26

3 Alternatives + Submit Alt

  • Repeat command after every 2 secs


    3
    watch -n 2 command
    pranavkn · 2012-03-20 19:55:52 0
  • For use when you can't use "watch" (user-defined functions, aliases). This isn't mine - its an alternate posted in the comments by flatcap, and is the shortest and easiest to remember.


    0
    while sleep 1; do foo; done
    lowbatteries · 2012-09-14 20:21:04 0
  • repeat a command every X seconds , output show the creation of partition image using fsarchiver, each line show the size of the image. Show Sample Output


    -2
    while x=0; do foo ; sleep 1 ; done
    eastwind · 2012-07-11 13:22:21 1

What Others Think

You can add precision if you don't want time shifting due to the duration of the command (--precise or -p option): watch -pn 1 "do foo"
frans · 302 weeks and 3 days ago
add a -d to highlight the difference in the output: watch -n 2 -d command
linuxswords · 300 weeks and 3 days ago
if I want to do something (execute download command again) when download is failed, what should I do?
renodesper · 291 weeks and 3 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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