Utility to clean/sort huge directories. For example for move all preview images (small files) from dir to another dir.

cleanDir.sh

#/bin/bash
# Author: Ondřej Profant, 2012
# Mail: ondrej.profant <> gmail.com
# Licence: GPL
# Utility to clean/sort huge directories. For example for move all preview images (small files) from dir to another dir.
LICENCE=GPL
VERSION=0.1
DEFAULT_LIMIT=$((10 << 10)); #10kb

function help() {
	echo -e "Parametrs:
\t-p\t--prefix\tDefine files prefix. Like \"tmp_\"
\t-s\t--sufix\t\tDefine files sufiix. Like \".jpg\"
\t-l\t--limit\t\tDefine files maximum size in bytes. Default value is 10kb.
\t-d\t--do\t\tDefine command - what to do. Use shell basic utility like echo, mv, rm, touch.
\t-v\t--version\tShow version.
\t-h\t--help\t\tShow this help. 
Author: Ondřej Profant, 2012
Mail: ondrej.profant <> gmail.com
Licence: $LICENCE";
};

function prepare_size() {
	unit=${1##*[0-9]} 				# crop start number
	value=${1%[kKmMgG][bB]};	# number itself

	case $unit in 
	kb | Kb )
		size=$(( $value << 10 ));
	;;
	mb | Mb )
		size=$(( $value << 20 ));
	;;
	gb | Gb )
		size=$(( $value << 30 ));
	;;
	* | b | B )
		size=${value}
	;;
	esac;
  
	echo $size
}

size_limit=$DEFAULT_LIMIT;
do=echo

while [ $# -gt 0 ]; do
 case $1 in
  -p | --prefix )
   prefix=$2;
	 shift 2;
  ;;
  -s | --sufix )
   sufix=$2;
   shift 2;
  ;;
  -l | --limit | --size-limit )
   size_limit=$( prepare_size $2 );
   shift 2;
  ;;
	-d | --do )
	 do=$2;
	 shift 2;
	;;
  -h | --help )
   help;
   exit 0;
	;;
	-v | --version )
	 echo "Version $VERSION";
	 exit 0;
  ;;
	* )
	echo "Unknow parametr $1. Use help ($0 --help) for usage.";
	exit 0;
	;;
 esac;
done;

for i in ${prefix}*${sufix}; do
 if [  -d  "$i"     ]; then continue; fi; # jump if dir
 if [ "$0" = "./$i" ]; then continue; fi; # jump if this script
 if [   "$0" = "$i" ]; then continue; fi; # jump if this script

 size=$( ls -l $i | cut -d " " -f 5 ) ;		# size of the file (bytes)
 if [ $size -lt $size_limit ]; then
	$do $i ;
 fi;
done;