[CentOS] linux batch job "sleep" problem???

Fri Jan 7 14:39:01 UTC 2011
mcclnx mcc <mcclnx at yahoo.com.tw>

we have Redhat 5.5 on server.  Recently we tried to use "sleep" command on batch job script some sleep work but some not sleep.   any one have ideal?


====   sample program  ===

#/bin/bash
set -v

program1
sleep 30
program2
sleep 60
program3
sleep 40
...