while DEMO
#!/bin/bash #author:xiluhua #since:20160619 let v_count=0 while [ "1" = "1" ] do if [ $v_count -lt 5 ] then sleep 1 echo $v_count let v_count=$v_count+1 else echo "exit" break fi done
原文：http://www.cnblogs.com/xiluhua/p/5598414.html
