#!/usr/bin/perl

($op = shift) || die "Usage: relink perlexpr [filenames]\n";
if (!@ARGV) {
    if (-t) {
	@ARGV = <*>;
    }
    else {
	@ARGV = <STDIN>;
	chop(@ARGV);
    }
}
for (@ARGV) {
    next unless -l;		# symbolic link?
    $name = $_;
    $_ = readlink($_);
    $was = $_;
    eval $op;
    die $@ if $@;
    if ($was ne $_) {
	unlink($name);
	symlink($_, $name);
    }
}