rename

#!/bin/sh
# 03/01/17 - Created by Andrew Puckett

if [ "$1" = "-h" ] || [ "$1" = "--help" ] || [ $# -lt 1 ]; then
	echo "NAME"
	echo "	$(basename $0) options"
	echo
	echo "DESCRIPTION"
	echo "	$(basename $0) is used to rename files in a directory."
	echo
	echo "OPTIONS"
	echo "	-d"
	echo "		Directory to use. Optional, default is current directory."
	echo "	-p"
	echo "		File prefix to remove. Either this or -q is required."
	echo "	-q"
	echo "		File postfix to remove. Either this or -p is required."
	echo "AUTHOR"
	echo "	Andrew Puckett"
	echo
	exit 1
fi

DIR=.
I=0
PREFIX=
POSTFIX=

while getopts d:p:q: opt
do
	case "$opt" in
		d) DIR=$OPTARG;;
		p) PREFIX=$OPTARG;;
		q) POSTFIX=$OPTARG;;
	esac
done

if [ -z "$PREFIX" ] && [ -z "$POSTFIX" ]; then
	echo "You must provide a prefix or postfix with the -p or -q option" && exit 1
fi

IFS="$(printf '\n\t')"
FILES=$(find $DIR/$PREFIX* -type f)
for FILE in $FILES
do
	if [ -z "$PREFIX" ]; then
		#only removes from the very end
		mv "$FILE" "$DIR/${FILE%$POSTFIX}"
	else
		mv "$FILE" "$DIR/${FILE#$DIR/$PREFIX}"
	fi
	I=$((I + 1))
done

echo "Renaming $I files"