#! /bin/bash

# "Divide" a crontab frequency down by the first argument on the command line,
# logging to the second argument, and executing the remainder.

if [ "X$1" = "X" -o "X$2" = "X" -o "X$3" = "X" ]; then
	echo "Usage: $0 frequency logfile command [ arguments ]" >&2
	exit 1
fi

FREQUENCY=$1
LOGFILE=$2
shift 2

if [ -f $LOGFILE ]; then
	LASTEXEC=$(($(tail -n 1 $LOGFILE)+1))
else
	LASTEXEC=1
fi

if [ $LASTEXEC -ge $FREQUENCY ]; then
	echo "$*" executed at $(date) >> $LOGFILE
	echo 0 >> $LOGFILE
	eval "$*"
else
	echo $LASTEXEC >> $LOGFILE
fi