Syntax for a single-line Bash infinite while loop

Question

I am having trouble coming up with the right combination of semicolons and/or braces. I\'d like to do this, but as a one-liner from the command line:

while [         


        

Answer 1

You can also make use of until command:

until ((0)); do foo; sleep 2; done

Note that in contrast to while, until would execute the commands inside the loop as long as the test condition has an exit status which is not zero.

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Using a while loop:

while read i; do foo; sleep 2; done < /dev/urandom

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Using a for loop:

for ((;;)); do foo; sleep 2; done

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Another way using until:

until [ ]; do foo; sleep 2; done