Template for ShellScripts

template.sh

#!/bin/bash
# ------------------------------------------------------------------
# [Author] Title
#          Description
#
#          This script uses shFlags -- Advanced command-line flag
#          library for Unix shell scripts.
#          http://code.google.com/p/shflags/
#
# Dependency:
#     http://shflags.googlecode.com/svn/trunk/source/1.0/src/shflags
# ------------------------------------------------------------------
VERSION=0.1.0
SUBJECT=some-unique-id
USAGE="Usage: command -hv args"

# --- Option processing --------------------------------------------
if [ $# == 0 ] ; then
    echo $USAGE
    exit 1;
fi

. ./shflags

DEFINE_string 'aparam' 'adefault' 'First parameter'
DEFINE_string 'bparam' 'bdefault' 'Second parameter'

# parse command line
FLAGS "$@" || exit 1
eval set -- "${FLAGS_ARGV}"

shift $(($OPTIND - 1))

param1=$1
param2=$2

# --- Locks -------------------------------------------------------
LOCK_FILE=/tmp/${SUBJECT}.lock

if [ -f "$LOCK_FILE" ]; then
echo "Script is already running"
exit
fi

trap "rm -f $LOCK_FILE" EXIT
touch $LOCK_FILE

# -- Body ---------------------------------------------------------
#  SCRIPT LOGIC GOES HERE
echo "Param A: $FLAGS_aparam"
echo "Param B: $FLAGS_bparam"
echo $param1
echo $param2
# -----------------------------------------------------------------