74a98e499e
Modified the README to include installation instructions and synchronized command line and README usage message.
96 lines
2.9 KiB
Bash
Executable File
96 lines
2.9 KiB
Bash
Executable File
#!/usr/bin/env bash
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# BITSC LICENSE NOTICE (MODIFIED ISC LICENSE)
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#
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# DIRECTORY DE-DUPLICATION ("Dirty Dupe")
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#
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# Copyright (c) 2022 Lee Ockert <torstenvl@gmail.com>
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# https://github.com/torstenvl
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#
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# THIS WORK IS PROVIDED "AS IS" WITH NO WARRANTY OF ANY KIND. THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY, FITNESS, NON-INFRINGEMENT, AND TITLE ARE
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# EXPRESSLY DISCLAIMED. NO AUTHOR SHALL BE LIABLE UNDER ANY THEORY OF LAW
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# FOR ANY DAMAGES OF ANY KIND RESULTING FROM THE USE OF THIS WORK.
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#
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# Permission to use, copy, modify, and/or distribute this work for any
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# purpose is hereby granted, provided this notice appears in all copies.
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############################################################################
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## FUNCTION TO PRINT USAGE INSTRUCTIONS ##
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############################################################################
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printusage() {
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echo "
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DIRECTORY DE-DUPLICATOR
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USAGE
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dirdedupe.sh [--execute] masterdir shadowdir
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DESCRIPTION
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For each file in shadowdir, replace it with a hard link to the matching file
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(if any) in masterdir. A file will be considered a match if, and only if,
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it shares the same file name, relative path, and contents.
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OPTIONS
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--execute Actually remove and link duplicate files. By default, this
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program runs in test mode.
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MISC
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The name of this utility is pronounced "dirty dupe."
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"
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}
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############################################################################
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## PARSE & MAKE SENSE OF COMMAND LINE ##
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############################################################################
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# CHECK FOR THE EXECUTE FLAG (DEFAULT IS TESTING-ONLY MODE)
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REALLYRUN=0
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if [ "${1}" == "--execute" ]; then
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REALLYRUN=1
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shift
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fi
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# MAKE SURE WE HAVE THE RIGHT NUMBER OF ARGUMENTS AND THEY'RE VALID
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if [ ! $# -eq 2 ]; then
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echo && echo "Wrong number of arguments!" && printusage && exit
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else
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masterdir=$1
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shadowdir=$2
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if [ ! -d "${masterdir}" ]; then
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echo && echo "${masterdir} is not a directory!" && printusage && exit
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elif [ ! -d "${shadowdir}" ]; then
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echo && echo "${shadowdir} is not a directory!" && printusage && exit
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fi
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fi
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############################################################################
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## HARDLINK THE DUPLICATES (OR NOT) ##
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############################################################################
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find "${shadowdir}" -print0 | while read -d $'\0' shadowfile
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do
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if [ -f "${shadowfile}" ]; then
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masterfile="${shadowfile/#${shadowdir}/${masterdir}}"
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if [ -f "${masterfile}" ]; then
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cmp -s "${masterfile}" "${shadowfile}"
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if [ $? -eq 0 ]; then
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if [ $REALLYRUN -gt 0 ]; then
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echo "Linking \"${masterfile}\" <-- \"${shadowfile}\""
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ln -Pf "${masterfile}" "${shadowfile}"
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else
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echo "NOT linking \"${masterfile}\" <-- \"${shadowfile}\""
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fi
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fi
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fi
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fi
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done
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exit
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