shell script templates

#!/bin/ksh
#
# @(#)$Id$
#
# Purpose

tmp=${TMPDIR:-/tmp}/prog.$$
trap "rm -f $tmp.?; exit 1" 0 1 2 3 13 15

...real work that creates temp files $tmp.1, $tmp.2, ...

rm -f $tmp.?
trap 0
exit 0

arg0=$(basename $0 .sh)

error()
{
    echo "$arg0: $*" 1>&2
    exit 1
}

vflag=0
out=
file=
Dflag=
while getopts hvVf:o:D: flag
do
    case "$flag" in
    (h) help; exit 0;;
    (V) echo "$arg0: version $Revision$ ($Date$)"; exit 0;;
    (v) vflag=1;;
    (f) file="$OPTARG";;
    (o) out="$OPTARG";;
    (D) Dflag="$Dflag $OPTARG";;
    (*) usage;;
    esac
done
shift $(expr $OPTIND - 1)

shift $(($OPTIND - 1))

: ${PERL:=perl}
: ${SED:=sed}

#!/bin/sh
## Usage: myscript [options] ARG1
##
## Options:
##   -h, --help    Display this message.
##   -n            Dry-run; only show what would be done.
##

usage() {
  [ "$*" ] && echo "$0: $*"
  sed -n '/^##/,/^$/s/^## {0,1}//p' "$0"
  exit 2
} 2>/dev/null

main() {
  while [ $# -gt 0 ]; do
    case $1 in
    (-n) DRY_RUN=1;;
    (-h|--help) usage 2>&1;;
    (--) shift; break;;
    (-*) usage "$1: unknown option";;
    (*) break;;
    esac
  done
  : do stuff.
}

#!/bin/ksh

# Script to turn lead into gold
# Copyright (C) 2009 Joe Q Hacker - All Rights Reserved
# Permission to copy and modify is granted under the foo license
# Last revised 1/1/2009

# I am not crazy, this really is the only way to do this

if [ $i = 1 ]; then
    ... some code
fi

[ $i = 1 ] && {
    ... some code
}

if [ $i -ne 1 ]; then
   ... some code
fi

[ $i = 1 ] || {
   ... some code
}

cat << EOF > foo.sh
   printf "%s was here" "$name"
EOF

printf "%s was here" "$name"

#!/bin/bash
# [ID LINE]
##
## FILE: [Filename]
##
## DESCRIPTION: [Description]
##
## AUTHOR: [Author]
##
## DATE: [XX_XX_XXXX.XX_XX_XX]
##
## VERSION: [Version]
##
## USAGE: [Usage]
##

#!/bin/bash -
#title           :mkscript.sh
#description     :This script will make a header for a bash script.
#author          :your_name_here
#date            :20110831
#version         :0.3
#usage           :bash mkscript.sh
#notes           :Vim and Emacs are needed to use this script.
#bash_version    :4.1.5(1)-release
#===============================================================================

set -o errexit

set -o nounset

set -o noclobber

set -o pipefail

shopt -s nullglob

set -o errexit -o nounset -o noclobber -o pipefail
shopt -s nullglob