repeat a command every x seconds

while x=0; do foo ; sleep 1 ; done
repeat a command every X seconds , output show the creation of partition image using fsarchiver, each line show the size of the image.
Sample Output
root@sysresccd /mnt/backup % while x=0; do ls -l test.ubuntu.12.04.fsa ; sleep 1 ; done
-rwxr-xr-x 1 root root 4045868127 Jul 11 13:17 test.ubuntu.12.04.fsa
-rwxr-xr-x 1 root root 4050159560 Jul 11 13:17 test.ubuntu.12.04.fsa
-rwxr-xr-x 1 root root 4053476778 Jul 11 13:17 test.ubuntu.12.04.fsa
-rwxr-xr-x 1 root root 4057533324 Jul 11 13:17 test.ubuntu.12.04.fsa
-rwxr-xr-x 1 root root 4060728604 Jul 11 13:17 test.ubuntu.12.04.fsa
-rwxr-xr-x 1 root root 4064071926 Jul 11 13:17 test.ubuntu.12.04.fsa
-rwxr-xr-x 1 root root 4067336585 Jul 11 13:17 test.ubuntu.12.04.fsa

-2
By: eastwind
2012-07-11 13:22:21

2 Alternatives + Submit Alt

What Others Think

You can shorten that in two ways. Either use the : operator which evaluates to true: (this is a simple way to create in infinite loop) while :; do foo; sleep 1; done or use the sleep as the while condition while sleep 1; do foo; done
flatcap · 310 weeks and 2 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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