Renaming script for shell

rename_script.sh

#!/bin/bash
# this is a renaming script
# @arguments:
# -f filename the filename to add (optional)
# -p path the folder to path to run (optional)
# -r if set runs recuresively
#
# it renames the files inside the folder
# adds a sequential number filename (01).jpg etc
# if no filename specified there is the option to use
# the name of the containing folder as filename 
#
# @install: 
# $ chmod +x rename_script.sh
# $ ln -s ~/rename_me.sh /usr/local/bin/rename_me 
#

function filename_select {
    select yn in "Yes" "No"; do
        case $yn in
            Yes ) FILENAME=${PWD##*/};break;;
            No ) echo "Exiting..."; exit;;
        esac
    done
}

function set_temp_name {
    local dir=$1;
    local file_count=1;

    ls -tUr "$dir" | while read i; 
    do
        ext=$(echo $i | awk -F . '{ if (NF>1) { print $NF } }')
        if [ "$ext" = "sh" ] || [ "$ext" = "" ]|| [ -d "$i" ]; then
            continue;
        else
            mv "$dir$i" "$dir$TEMP_NAME$file_count.$ext"; 
            ((file_count++));
        fi
    done;
}

# Batch renaming files in ordered numbers
function rename_folder() {
    local filename=$1;
    local dir=$2;
    local pic_count=1;
    local vid_count=1;
    local pic_num=;
    local vid_num=;
    local ext= ; 

    if [[ -z "$dir" ]]
    then
        dir=$DIR;
    fi

    if [[ -z "$SAME_AS_FOLDER" ]] || [[ -z "$filename" ]]
    then
        filename=$FILENAME;
    fi

    set_temp_name "$dir"

    # remove - from the beginning of the name
    filename=$(echo $filename | sed -e "s/-//");

    ls -tUr "$dir" | while read i; 
    do
        ext=$(echo $i | awk -F . '{ if (NF>1) { print $NF } }')
        ext=$(echo $ext | awk '{print tolower($0)}');

        if [ "$ext" = "sh" ] || [ "$ext" = "" ]|| [ -d "$i" ]; then
            if [ -d "$dir$i" ] && $RECUR ; then
                rename_folder "$i" "$dir$i/";
            fi
            continue;
        else
            if [ $ext = 'jpg' ] || [ $ext = 'JPG' ] || [ $ext = 'png' ] || [ $ext = 'PNG' ] || [ $ext = 'tiff' ] || [ $ext = 'TIFF' ] || [ $ext = 'gif' ] || [ $ext = 'GIF' ]; then 
                pic_num=$(printf "%02d" ${pic_count})
                echo "Renaming: \"$dir$i\"" "to: \"$dir$filename ($pic_num).$ext\""; 
                mv "$dir$i" "$dir$filename ($pic_num).$ext"; 
                ((pic_count++));
            else
                vid_num=$(printf "%02d" ${vid_count})
                echo "Renaming: \"$dir$i\"" "to: \"$dir'Video - '$filename ($vid_num).$ext\""; 
                video_str="Video - ";
                mv "$dir$i" "$dir$video_str$filename ($vid_num).$ext"; 
                ((vid_count++));
            fi
        fi
    done;
}

# temp name
TEMP_NAME="_rename_temp"$(date +%s);

# default to run on current directory
DIR='./'
# not recursive is the default
RECUR=false

SAME_AS_FOLDER=;

while [ $# -gt 0 ]
do
    case "$1" in
        -r)  RECUR=true;;
        -p)  DIR='./'$2;;
        -f)  FILENAME="$2"; shift;;
        --) shift; break;;
        -h)
            echo >&2 \
            "usage: rename_script [-p path/]"
            exit 1;;
        *)  break;; # terminate while loop
        esac
    shift
done

# check fi filename is provided
if [[ -z "$FILENAME" ]]
then
    echo "Do you want to use the folder name as filename?"
    SAME_AS_FOLDER=true;
    filename_select;
fi

rename_folder;