fix_file_permissions.sh

#!/bin/bash 
# Fixing permissions for group members. System default is UMASK 077 or 022, 
# which makes file invisible to members of the group.
# 
# This script recursively sets:
#  * all directories under the given directory to 775
#  * all files under the given directory to 664
# That is, the owner and group members have full rwx permissions, 
# and others can access all directories and read, but not write/delete files.
#
# Potential pitfalls:
#  * Files from a certain list of extensions will be set to user and group executable (774)
#    This is not necessarily the desired behaviour. Other previously executable files
#    may have to be reset manually
#
# Chris Waigl, chris.waigl AT gmail.com
# 
# CHANGELOG:
# 2013-06-02 - CW - Initial creation

if [ -z $1 ] || [ -f $1 ]; then
    echo "Argument missing or not a directory. Usage: $0 <directory>" 
    exit 1
fi
if [ $# -ge 2  ]; then
    echo "Too many arguments. Ignoring any but the first."
fi

find $1 -type d -exec chmod 775 {} \;
find $1 -type f -exec chmod 664 {} \;
find $1 -type f \( -iname "*.py" -o -iname "*.pl" -o -iname "*.ncl" -o -iname "*.sh" \) -exec chmod 774 {} \;