BASH Script to recursively set directory / file permissions & ownership

chmodr.sh

#!/bin/bash
#
# chmodr.sh
#
# Original Author: Francis Byrne
# date: 2011/02/12
#
# Modified Script for recursively setting permissions & ownership for directories
# and files to defined or default permissions using chmod & chown.
#
# If no options are specified, it recursively resets all directory and file
# permissions to the default for most OSs (dirs: 755, files: 644). File & directory
# ownership is set recursively to the user running the script (unless set with -u -g).
#

usage()
{
  echo "Usage: $0 PATH -d DIRPERMS -f FILEPERMS -u USERPERMS -g GROUPPERMS"
  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"
  echo " -u USERPERMS, user permissions"
  echo " -g GROUPPERMS, group permissions"
  echo " -h | -? this help message"
  exit 1
}

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

while getopts  "d:f:u:g:h" flag
do
    case "$flag" in
    	d)  DIRPERMS="$OPTARG";;
    	f)  FILEPERMS="$OPTARG";;
    	u)  USERPERMS="$OPTARG";;
    	g)  GROUPPERMS="$OPTARG";;
        h)  usage;;
  	\?) 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

# Default user / group if not set on the command line
if [ -z "$USERPERMS" ] && [ -z "$GROUPPERMS" ] ; then
  USERPERMS=$USER
  GROUPPERMS=$USER
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 -print0 | xargs -0 chmod -v $DIRPERMS
fi

if [ -n "$FILEPERMS" ] ; then
  find $ROOT -type f -print0 | xargs -0 chmod -v $FILEPERMS
fi

# Recursively set user:group permissions
chown -Rv $USERPERMS:$GROUPPERMS $ROOT