#!/bin/bash

# *************************************************************

# File: getcrontab.sh

# Date: 2008-07-16 10:55

# Author: Marko Schulz - <info@tuxnet24.de>

# Description: Save all crontabs of all unixusers where the UID is greater than 1000.

# *************************************************************

# List of unixuser that will be ignored (space seperated list).

prune="nobody"

# Directory where the crontabs will be stored.

directory="/data/backup/$( hostname )/crontabs"

# *************************************************************

# This function save the crontab of the current unixuser in

# the backup directory and set the file access to 640. Empty

# crontab files will be deleted.

function rc_save_crontab () {

local user=$1

local directory=$2

# Backup the crontab of the current user.

crontab -u ${user} -l >${directory}/${user} 2>/dev/null

# Delete all empty crontabs.

[ ! -s "${directory}/${user}" ] && rm -f ${directory}/${user}

# Remove read access for others.

[ -f "${directory}/${user}" ] && chmod o-r ${directory}/${user} 2>/dev/null

}

# *************************************************************

# Program action...

# Replace all spaces into pipe character.

prune=$( echo $prune | sed 's/[[:space:]]\{1,\}/|/g' )

# Create backup directory if not exists.

[ ! -d "$directory" ] && mkdir -p $directory 2>/dev/null

# First, we clean the directory.

rm -f ${directory}/*

# Match all vailed unixuser...

for user in $( awk -F: '$1 !~ /('$prune')/ && $3 >= 1000 { print $1 }' /etc/passwd ); do

	rc_save_crontab "${user}" "${directory}"

done

# At last we save the crontab entry from root.

rc_save_crontab "root" "${directory}"

# *************************************************************

# EOF