http://blog.powdahound.com/post/189982500/mkscript-test-script-creator

mkscript

#!/bin/bash

###############################################################################
# mkscript is a tool to quickly create executable script files
#
# Instead of:
#   echo '#!/usr/bin/python' > test.py
#   chmod a+x test.py
# Just do:
#   mkscript test.py
#
# If no extension is given, an empty executable file will be created. Supported
# extensions and their initial contents are defined in the $templates variable
# below.
#
# Author: Garret Heaton (http://powdahound.com)
# Created: 2009-09-07
# Last rev: 2009-09-16
###############################################################################

# List of extensions and their initial contents
templates="
php  #!/usr/bin/php\n<?php
pl   #!/usr/bin/perl -w
py   #!/usr/bin/python
rb   #!/usr/bin/ruby
sh   #!/bin/bash
"

if [ $# -eq 0 ]; then
  echo "Usage: mkscript <script.ext>"
  exit 1
fi

# create file
file=$1;
if [ -e $file ]; then
  echo "'$file' already exists"
  exit 2
fi
touch $file
chmod a+x $file

# add shebang if an extension was provided that we have a template for
ext=""
if [[ $file =~ .*\.([a-z]*)$ ]]; then
  ext=${BASH_REMATCH[1]}

  # find template for this extension
  template=`echo "$templates" | grep -E "^$ext"`
  if [[ $template =~ ([a-z]*)\ *(.*) ]]; then
    echo -e "${BASH_REMATCH[2]}\n\n" > $file
  fi
fi

echo "Created script: $file"