Code Fragment Collection

This function is useful to display and record the warning count. You may later use the count as failure exit code.

function warning()
{
	echo "$@" 1>&2
	((WARNING_COUNT++))
}

Strip directory name and suffix

name=`basename $file_path $suffix`

Using trap do remove temporary files

Creates temporary files and uses exit trap to delete it

tmpfile=`mktemp`

# ... your code is here ...

trap 'rm -f $tmpfile' EXIT

basename=${file##*/}

dirname=${file%/*}

To turn on the debugging replace the top line of the script.

#!/bin/bash -x

Parsing command line

show_help=
show_version=
option=
param=

while test $# -gt 0 ; do
	arg=`expr "x$1" : 'x[^=]*=\(.*\)'`
	case $1 in
		--help | -h | '-?' )
			show_help=yes
			;;
		--version | -v )
			show_version=yes
			;;
		--opt | --option | -o )
			option=yes
			;;
		--param | --param=* )
			test -z "$arg" && shift && test $# -gt 0 && arg=$1
			param=$arg
			;;
		-*) 
			echo invalid option: $1 && exit 1
			;;
		*)
			# process argument
			echo "argument: [$1]"
			;;
	esac
	shift
done


echo "show_help [$show_help]"
echo "show_version [$show_version]"
echo "option [$option]"
echo "param [$param]"

ext=${file##*.}

HERE construction

print <<< HERE

  Text to be printed..
  
HERE;

Typical die function

This function just prints the message and exists. The general usage can be something like that:

do_some_thing || die "could not do it"

function die()
{
	echo "$@" 1>&2
	exit 1
}