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Short method of "while x=0; do foo ; sleep 1 ; done"
There are 2 alternatives - vote for the best!
Repeat command after every 2 secs
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.
repeat a command every X seconds , output show the creation of partition image using fsarchiver, each line show the size of the image.
If you can do better, submit your command here.
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