#!/bin/sh
# .quit, .who, ;, .time
echo "+++ hello
+++ welcome to the sh talker
+++
+++ what's your name ?"

cd `dirname $0`

if [ ! -d users ]; then
	mkdir users
fi
cd users

read X
X=`echo $X | sed 's/
$//'`
echo "+++ welcome, $X"

for USER in * ; do
	if [ -w "$USER" ]; then
		echo "+++ $X has connected" >> $USER
	fi
done
touch $X

read Y
while [ ".quit
" != "$Y" ] ;
do
	case "$Y" in
	".who
")
		ls | sed 's/^/+++ /';;
	".time
")
		date | sed 's/^/+++ /';;
	\;*)
		Y=`echo $Y|sed 's/^.//'`
		for USER in * ; do
			if [ -w "$USER" ]; then
				echo "$X $Y" >> $USER
			fi
		done;;
	*)
		for USER in * ; do
			if [ -w "$USER" ]; then
				echo "$X :$Y" >> $USER
			fi
		done;;
	esac
	cat $X
	rm $X
	touch $X
	read Y
done

echo "+++ bye then"
rm $X
for USER in * ; do
	if [ -w "$USER" ]; then
		echo "+++ $X has disconnected" >> $USER
	fi
done
if [ ! -f * ]; then
	cd ..
	rmdir users
fi