Loops in UNIX Shell Scripts - while Statement

The while construct allows iterations through a block of script as long as a certain condition is true.

Syntax:

while condition
do
commands
done

Example:

The example script counts up to10 secs.

#!/bin/sh

i=1
while [ $i -le 10 ];
do
   sleep 1
   print "$i"
   i=` expr $i + 1 `
done

exit 0

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