Oracle - Delete dmp files from ASM diskgroup

I want to delete my export files daily from ASM diskgroup with a crontab job. I want to prepare a script for it. ASMCMD> ls exp1.dmp exp2.dmp exp3.dmp exp4.dmp ASMCMD> pwd +DATA/EXP How can I prepare this script? I prepared a template for it, but I couldn't script it.

set_gridenv
asmcmd
cd +DATA/EXP
rm -rf exp*.dmp
exit