MAC - L2 address formatter

mac.sh

#! /bin/sh

# MAC - L2 address formatter
# Copyright (C) 2011, 2014 Matous J. Fialka, <http://mjf.cz/>
# Released under the terms of The MIT License

FORMAT=Collon
LETTER_CASE=Keep

while [ $# -gt 0 ]
do
	case $1 in

	-c)	FORMAT=Collon ;;
	-d)	FORMAT=Dash ;;
	-dd)	FORMAT=Dash2 ;;
	-o)	FORMAT=OUI LETTER_CASE=Upper;;
	-p)	FORMAT=Period ;;
	-x)	FORMAT=Hexa ;;

	-l)	LETTER_CASE=Lower ;;
	-u)	LETTER_CASE=Upper ;;
	-k)	LETTER_CASE=Keep ;;

	-h)	cat <<- .
		Usage: mac [-h] [-cdpx] [-uln] [address ...]
		
		   -h		This help

		Output format:

		   -c		Colons (default)
		   -d		Dashes
		   -dd		Dashes (2-octet form)
		   -o		IEEE oui.txt (-dd but first 3 octets only)
		   -p		Periods
		   -x		Heximal

		Letter case:

		   -l		Lower
		   -u		Upper
		   -k		Keep (default)

		Notes:

		   Letter case is keeped intact by default.

		   Options -c, -d and -p are to be combined with options -u
		   and -l.  The format set by the -l, -u or -k is global.

		Example:

		   $ mac -l -d AABB.ccdd.EEFF -p AABB-CCDD-EEFF -c AABBCCDDEEFF
		   aabb-ccdd-eeff
		   aabb.ccdd.eeff
		   aa:bb:cc:dd:ee:ff
		.

		exit 0
		;;

	*)
		echo $1 |

		sed 's/^0[xX]//; s/[:.-]//g' |

		if ! grep '^[0-9a-fA-F]\{12\}$'
		then
			echo Warning: invalid MAC address \`$1\'. 1>&2
		fi |

		case $FORMAT in

		Collon)	sed 's/\([0-9a-fA-F]\{2\}\)/\1:/g; s/:$//' ;;
		Dash)	sed 's/\([0-9a-fA-F]\{4\}\)/\1-/g; s/-$//' ;;
		Dash2)	sed 's/\([0-9a-fA-F]\{2\}\)/\1-/g; s/-$//' ;;
		Period)	sed 's/\([0-9a-fA-F]\{4\}\)/\1./g; s/\.$//' ;;
		Hexa)	sed 's/\([0-9a-fA-F]\{12\}\)/0x\1/g' ;;
		OUI)	sed 's/[0-9a-fA-F]\{6\}$//; s/\([0-9a-fA-F]\{2\}\)/\1-/g; s/-$//' ;;

		esac |

		case $LETTER_CASE in

		Upper)	tr a-f A-F ;;
		Lower)	tr A-F a-f ;;
		Keep)	cat ;;

		esac
		;;
	esac

	shift
done

unset FORMAT
unset LETTER_CASE

exit 0

TODO

• refactor source code
• add xsel(1x) support for X server selections