home automation - a bash script to trigger an asterisk call

if [ -z $2 ];
 then
    echo "syntax: gencall filename time"
    exit
fi

cp /var/lib/asterisk/calls/$1 /var/spool/asterisk/tmp/$1
NOW=`date +%s`
let NOW=$NOW+$2
TOUCH_TMSP=`date -d "1970-01-01 $NOW sec GMT" +%Y%m%d%H%M.%S`
touch -t $TOUCH_TMSP /var/spool/asterisk/tmp/$1
mv /var/spool/asterisk/tmp/$1 /var/spool/asterisk/outgoing
chown asterisk:x10 /var/spool/asterisk/outgoing/$1