🚀 go-pugleaf

peter@merlin.acadiau.ca (Peter Steele) writes:

>I need to write a script that takes a list and generates
>various permutations of that list, e.g., if the list is
>"a b c", I want to generate the following data sets:
...

I guess that you want all strings "p1 p2" where p1 and p2 are
prefixes of 'a,b,...' and p1 is a prefix of p2.

In that case, try this.  (Invoke as 'script a b c', for example.)

#!/bin/sh
(
	mkdir /tmp/abc$$
	cd /tmp/abc$$
	f=
	for x
	do
		cat < /dev/null > "$f$x"
		f="$f$x,"
	done
	for x in * ;
	do
		for y in `echo $x*` ;
		do
			echo $x $y
		done
	done
	rm -rf /tmp/abc$$
) | sort # just in case globbing doesn't return files in alphabetical order
--
        Erik Rantapaa                   rantapaa@math.umn.edu

 Imagination is the one weapon in the war against reality.
 		-- Jules de Gaultier