gecko-dev/security/nss/tests/path_uniq

#! /bin/perl

########################################################################
#
# /u/sonmi/bin/path_uniq
#
# this script makes components of a PATH like string unique cand prints
# it to stdout
#
# parameters
# ----------
#    PATH
#
# options
# -------
#     -d delimiter - default : 
#
# usefull enhancements: in the usage part, try to guess what was meant as 
# a path and echo it to stdout to not break for PATHs with blanks
#
########################################################################

sub usage {
    print STDERR "usage $0 [-d <delimiter>] PATH\n";
    print STDERR "    this script makes components of the PATH unique, if you\n";
    print STDERR "    pass in a searchpath A:B:C:A:B:E it will print A:B:C:E to\n";
    print STDERR "    the stdout\n";
    print STDERR "    the parameters you gave were: ";
    for ( $i = 0; $i <= $#ARGV; $i++ ) {
        print STDERR "        $ARGV[$i]\n";
    }
    exit ;
}


$i = 0;
$j = 0;
$delimiter = ":";
$searchpath = "";
@pathcomponents;
$found=0;
$newpath="";


if ( $ARGV[0] eq '-d' ) {
    if ( $#ARGV != 2 ) {
        usage;
    }
    $delimiter = $ARGV[1];
    $searchpath = $ARGV[2];
} else {
    if ( $#ARGV != 0 ) {
        usage;
    }
    $searchpath = $ARGV[0];
}

@pathcomponents=split($delimiter, $searchpath);


for ( $i = 0; $i <= $#pathcomponents; $i++ ) {
    $found=0;
    for ( $j = 0; $j < $i; $j++ ) {
        if ( $pathcomponents[$j] eq $pathcomponents[$i] ) {
            #print "$i and $j match - $pathcomponents[$i] - $pathcomponents[$j]\n";
            $found=1;
            last;
        }
    }
    if ( $found == 0 ) {
        #print "$pathcomponents[$i]:";
        if ($i == 0) {
            $newpath = $pathcomponents[$i];
        } else {
            $newpath=join($delimiter, $newpath,$pathcomponents[$i]);
        }
    }
}
print "$newpath\n";
exit;