Wicked Cool Shell Scripts by Dave Taylor & Brandon Perry

Author:Dave Taylor & Brandon Perry
Language: eng
Format: epub, mobi
Publisher: No Starch Press
Published: 2017-04-10T04:00:00+00:00

The Code

#!/bin/bash # backup--Creates either a full or incremental backup of a set of defined # directories on the system. By default, the output file is compressed and # saved in /tmp with a timestamped filename. Otherwise, specify an output # device (another disk, a removable storage device, or whatever else floats # your boat). compress="bzip2" # Change to your favorite compression app. inclist="/tmp/backup.inclist.$(date +%d%m%y)" output="/tmp/backup.$(date +%d%m%y).bz2" tsfile="$HOME/.backup.timestamp" btype="incremental" # Default to an incremental backup. noinc=0 # And here's an update of the timestamp. trap "/bin/rm -f $inclist" EXIT usageQuit() { cat << "EOF" >&2 Usage: $0 [-o output] [-i|-f] [-n] -o lets you specify an alternative backup file/device, -i is an incremental, -f is a full backup, and -n prevents updating the timestamp when an incremental backup is done. EOF exit 1 } ########## Main code section begins here ########### while getopts "o:ifn" arg; do case "$opt" in o ) output="$OPTARG"; ;; # getopts automatically manages OPTARG. i ) btype="incremental"; ;; f ) btype="full"; ;; n ) noinc=1; ;; ? ) usageQuit ;; esac done shift $(( $OPTIND - 1 )) echo "Doing $btype backup, saving output to $output" timestamp="$(date +'%m%d%I%M')" # Grab month, day, hour, minute from date. # Curious about date formats? "man strftime" if [ "$btype" = "incremental" ] ; then if [ ! -f $tsfile ] ; then echo "Error: can't do an incremental backup: no timestamp file" >&2 exit 1 fi find $HOME -depth -type f -newer $tsfile -user ${USER:-LOGNAME} | \ ➊ pax -w -x tar | $compress > $output failure="$?" else find $HOME -depth -type f -user ${USER:-LOGNAME} | \ ➋ pax -w -x tar | $compress > $output failure="$?" fi if [ "$noinc" = "0" -a "$failure" = "0" ] ; then touch -t $timestamp $tsfile fi exit 0

Listing 6-16: The backup script

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