Cacher is the code snippet organizer for pro developers

#!/bin/sh
# 
# chmodr.sh
#
# author: Francis Byrne
# date: 2011/02/12
#
# Generic Script for recursively setting permissions for directories and files
# to defined or default permissions using chmod.
#
# Takes a path to recurse through and options for specifying directory and/or 
# file permissions.
# Outputs a list of affected directories and files.
# 
# If no options are specified, it recursively resets all directory and file
# permissions to the default for most OSs (dirs: 755, files: 644).

# Usage message
usage()
{
  echo "Usage: $0 PATH -d DIRPERMS -f FILEPERMS"
  echo "Arguments:"
  echo "PATH: path to the root directory you wish to modify permissions for"
  echo "Options:"
  echo " -d DIRPERMS, directory permissions"
  echo " -f FILEPERMS, file permissions"
  exit 1
}

# Check if user entered arguments
if [ $# -lt 1 ] ; then
 usage
fi

# Get options
while getopts d:f: opt
do
  case "$opt" in
    d) DIRPERMS="$OPTARG";;
    f) FILEPERMS="$OPTARG";;
    \?) usage;;
  esac
done

# Shift option index so that $1 now refers to the first argument
shift $(($OPTIND - 1))

# Default directory and file permissions, if not set on command line
if [ -z "$DIRPERMS" ] && [ -z "$FILEPERMS" ] ; then
  DIRPERMS=755
  FILEPERMS=644
fi

# Set the root path to be the argument entered by the user
ROOT=$1

# Check if the root path is a valid directory
if [ ! -d $ROOT ] ; then
 echo "$ROOT does not exist or isn't a directory!" ; exit 1
fi

# Recursively set directory/file permissions based on the permission variables
if [ -n "$DIRPERMS" ] ; then
  find $ROOT -type d | xargs chmod -v $DIRPERMS
fi

if [ -n "$FILEPERMS" ] ; then
  find $ROOT -type f | xargs chmod -v $FILEPERMS
fi