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	#!/bin/sh

	# -------------------------------------------------------------
	# whom-diff
	#
	# Computes the diff between two `whom` invoke.
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	# Author: Sébastien Santoro aka Dereckson
	# Created: 2015-12-30
	# Licence: BSD-2-Clause
	# -------------------------------------------------------------

	# -------------------------------------------------------------
	# Determines session identifier and directory
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

	if [ "$SESSION_ID" = "" ]; then
	SESSION_ID=`who am I \| md5 \| cut -c1-8`
	fi

	DIR=/var/tmp/whom/$USER/$SESSION_ID

	# -------------------------------------------------------------
	# -s / --session
	# Prints the session identifier
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

	if [ "$1" = "--session" ] \|\| [ "$1" = "-s" ]; then
	echo $SESSION_ID
	exit 0
	fi

	# -------------------------------------------------------------
	# Default mode
	# Prints the diff between current `whom` and previous output
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

	if [ $# -eq 0 ]; then
	# Creates working directory if needed
	if [ ! -d $DIR ]; then
	mkdir -p $DIR
	touch $DIR/old
	fi

	# Let's diff
	cd $DIR
	whom > current
	diff old current \| tail -n +2
	mv current old

	exit 0
	fi

	# -------------------------------------------------------------
	# -c / --clean
	# Cleans directory
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

	if [ "$1" = "--clean" ] \|\| [ "$1" = "-c" ]; then
	rm -rf $DIR
	exit $?
	fi

	# -------------------------------------------------------------
	# Usage
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

	>&2 echo "Usage: $0 [--setup\|--clean\|-s\|-c]"
	exit 1

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