#!/bin/sh
# Writes a message ($2 ...) to the most recently active terminal of user $1
# Unlike write, it also works on xterms. The most recently active one is
# determined by comparing device file modification times (equivalent to most
# recent output).

# list of tty's on which user is logged in:
LIST=`who | awk '/^'$1'[[:space:]]*tty/ {print "/dev/"$2}'`

# debugging:
#echo >> /tmp/writex.debug
#echo "tty list: $LIST" >> /tmp/writex.debug

# in the case of X login, add pseudo terminals (X terminals):
if who | grep '^'$1'[[:space:]]*:0' &> /dev/null; then
	shopt -s nullglob
	LIST=`echo $LIST /dev/pts/*`
fi

#echo "complete list: $LIST" >> /tmp/writex.debug

if [ -z "$LIST" ]; then
	echo "writex: $1 is not logged in!"
	exit 1
fi

# find most recently active terminal:
TERMDEV=
for term in $LIST; do 
  if [ -z "$TERMDEV" -o "$TERMDEV" -ot $term ]; then
	TERMDEV=$term
  fi
done

shift

echo $@ > $TERMDEV