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PATH =`munch.pl $PATH`

setenv PATH `munch.pl $PATH`

#!/usr/bin/perl -w
use strict;
...
my %saw = ();
@saw{@comp} = ();
print join ":",keys %saw;

$ TEST="a:b:c:a:c:z:a:b:z"
$ echo $TEST 
...
$ TEST=`tmp/test.pl $TEST`
$ echo $TEST
a:z:b:c

> setenv TEST "a:b:c:a:c:z:a:b:z"
> echo $TEST
...
> setenv TEST `tmp/test.pl $TEST`
> echo $TEST
a:z:b:c