may i know what

cp $1 $2
    $0 $2

Did you come up with this ?

cp $1 $2
    $0 $2

DESCRIPTION
       Copy SOURCE to DEST, or multiple SOURCE(s) to DIRECTORY.

cp $1 $0 $2

well, i read in a book,

if [ $# -eq 2 ]; then
	cp $1 $2
	$0 $2
else
	tmp=`cat $1 | wc -l`
	echo $tmp
	while [ $tmp -ne 0 ] ; do
		echo `head -$tmp $1 | tail +$tmp` >> $1.tmp
		tmp=$(($tmp -1))
	done
	mv $1.tmp $1
fi

cp $1 $2
	$0 $2

That looks better.

if [ $# -eq 2 ]; then
	cp $1 $2
	$0 $2
else

hmm so it is a recursivity script
thanks

Not a recursive one. I made a mistake in my explanation.

The point is..

If you have two arguments, then make arg1 and arg2 the same.

Else, find the numbers of lines in $1 and carry on ..

Vino

well im not talking about recursivity!
i wish to know how does this work?