export -f

function checkGroupName()
{
local groupName=$1
cat /etc/group | awk -F':' '{print $1}' |grep -w ^$groupName$
if [ $? -eq 0 ]
then
echo "[ERROR]: Group $groupName has already existed,please check and delete the group." >> $logfile
exit 7
fi
}
export -f checkGroupNam

export -f xxx将方法xxx引为系统方法