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twitterSmall script to enable quick randomization of files in a directory and conversion back to original names later. Original inspiration was a way to blind data analysis, e.g. if studying images from an experiment and don't want to be biased by the conditions applied.
Small script to enable quick randomization of files in a directory and conversion back to original names later. Original inspiration was a way to blind data analysis, e.g. if studying images from an experiment and don't want to be biased by the conditions applied.
The script is commented and pretty self-explanatory, so i won't spend time going over it---see below for the script and download. It include the ability to input specific directories, wasn't going to add it at first, but might as well have the feature. One neat trick is using usrDir=`cd $2; pwd`/ to get the absolute path from a users relative path. Yes, i decided to use getopts this time. Other than that, pretty standard fare. Enjoy!
download the script
- # !/bin/bash
- # biafra ahanonu
- # updated: 2013.06.14
- # randomly rename files in directory and convert back when needed; the extensions of the files are conserved during the change.
- #TODO:
- # add option (-i) to hide output
- # allow regexp option (-r) via sed filter or other to allow only particular files to be chosen
- # test with foreign characters (e.g. é, ñ, etc.)
- #Reset if getopts was used previously
- OPTIND=1
- getArgs(){
- # branches script based on input options
- # list of options, colon signifies options that should have an argument after
- optionsCheck=":hd:e:"
- # if no input...
- if [[ -z $1 ]]; then
- echo "Please enter an argument"
- separator
- viewHelp
- exit 0
- fi
- # check if directory set, else use local folder
- # ${!#}
- if [ -z "$3" ]; then
- usrDir="./"
- elif [[ $3 ]]; then
- usrDir=$3
- fi
- # branch based on options
- while getopts $optionsCheck opt; do
- case "$opt" in
- h|\?)
- viewHelp
- exit 0
- ;;
- e)
- logfile=$OPTARG
- encode $logfile $usrDir
- ;;
- d)
- logfile=$OPTARG
- decode $logfile $usrDir
- ;;
- *)
- echo "Please enter an argument"
- exit 0
- ;;
- esac
- done
- # shift off the options and optional --.
- shift $((OPTIND-1))
- }
- viewHelp(){
- # help documents, called in getArgs
- echo -e 'file hasher v1.0 by biafra ahanonu\n'
- echo -e 'randomize.sh -options [DIRECTORY]\n'
- echo 'DIRECTORY defaults to ./ (current dir) unless specified. Full paths are stored in log file.'
- echo 'OPTIONS'
- echo -e '\t-e [file] : randomly renames DIRECTORY files and stores hash in [file]'
- echo -e '\t-d [file] : reads hashes from [file] and renames DIRECTORY files accordingly'
- echo -e '\t-h/-help : displays help (little catch-22)'
- }
- encode(){
- # randomize files inside a folder and store log in above folder
- # Get absolute path to improve later decoding
- usrDir=`cd $2; pwd`/
- # !clear/create new log file
- logfile=$usrDir$1;rm $logfile;touch $logfile
- echo 'encoding files...log is '$logfile
- # get extension and base for log file
- ext=${logfile##*.};fbname=${logfile%.*}
- # loop over each file, get random number and rename
- separator
- for oldFile in $( find $usrDir -maxdepth 1 -type f ); do
- if [[ "$oldFile" == *"$logfile"* ]]; then
- continue
- fi
- # get old file extension to preserve
- ext=${oldFile##*.}
- # use $RANDOM to generate random, extension preserved filename
- randomFile="$usrDir$RANDOM"."$ext"
- # ...
- mv $oldFile $randomFile
- # mv $oldFile oldfiles/$oldFile
- echo -e $oldFile"\t"$randomFile >> $logfile
- echo $oldFile -\> $randomFile
- done
- separator
- echo "-encoding finished, log stored in $logfile"
- echo "-to decode, type: randomize.sh -d $logfile"
- }
- decode(){
- # convert files in the log back to their original form
- echo 'decoding files from '$2$1
- logfile=$2$1
- # read each line of log, print out conversion then pass a mv command to system
- separator
- gawk '{print $2" -> "$1; system("mv "$2" "$1)}' $logfile
- separator
- echo 'Decoded files!'
- }
- separator(){
- # standardize separator output...
- echo "---------------------"
- }
- #run script
- getArgs $@