Duy Dinh - 2012-02-29 
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#!/bin/bash
# Shell script to find and remove files with a particular extension under a directory and its subdirectories (recursively). 
# Directory names are preceeded by a hash sign, files names are displayed in an absolute format.
# Duy Dinh, IRIT - University of Toulouse, Febr. 2012

args=$* # program arguments except $0

inputDir="." # current directory

extensions="" # list of file extensions
fileFilterSpec="" # file filter specification (e.g., txt|html|php)
useFilter=0 # use file filtering (1) or not (0)

recursive=0 # recursive file listing

usage(){
    echo "Usage:"
    echo "sh removeFiles.sh [-r] [-d inputDir] -e filtersension"
    echo "Example:"
    echo "sh removeFiles.sh -r -d ./ -e \"htm|html|txt|php\""
}

# check whether file extension is valid or not
checkFileExtension(){
    local extension=$1

    matchExtension=0 # returned value of this function
    local ext="";
    #echo "extensions: $extensions"
    for ext in $extensions
    do
        #echo $ext
        if [ $ext = $extension ] || [ $ext = ".${extension}" ] 
        then
            #echo "Matched"
            matchExtension=1
            break
        fi
    done    
}

# function browse_directory
browse_directory()
{
    if !(test -d "$1")  then 
        echo "File or directory not found: $1";
        return;
    fi

    cd "$1"
    path=`pwd` # directory name 
    #echo "#$path"

    # get file entries from current path
    for e in *
    do
        if test -d "$e"  # entry is a directory
        then
            if [ $recursive = 1 ]
            then
                browse_directory "$e" #list files recursively
                cd ..           
            fi      
        else # file entry
            # get file extension            
            extension=${e##*.}
            checkFileExtension $extension
            #echo $matchExtension
            # if not use file filtering, test file extension with or without the period before

            if [ $useFilter = 0 ] || [ $matchExtension = 1 ]
            then

                # make file name absolute
                path=`pwd`; # directory name 
                path="$path/$e"; # file name
                echo "Removing file $path"

                rm "$path"
            fi

        fi
    done
}

# main procedure
main()
{

    if (test $# -eq 0)
    then    
        usage
        exit
    fi

    inputDir=$1
    # parse options
    while getopts ":d:e:o:rh" args; do

    case $args in
        d)
            inputDir=$OPTARG;;
        e)
            fileFilterSpec=$OPTARG          
            # echo $fileFilterSpec
            # transform filters into list of extensions 
            extensions=`echo $fileFilterSpec | tr ";,:|" " "`
            ;;
        r)
            recursive=1;;
        h)
            usage
            exit;;

        ?) # unknown option
            echo "Invalid option: -$OPTARG"
            exit;;
    esac
    done

    # file filter or not
    useFilter=`expr length "$fileFilterSpec"`

    echo "Input directory: $inputDir"
    if test $useFilter -gt 0
    then
        echo "File filter(s) $fileFilterSpec"       
    else
        echo "Please specify file extension and try again!"
    exit
    fi

    # browse input directory
    browse_directory $inputDir  
}

# call main procedure
main $args
 

Last edit: Duy Dinh 2012-03-07