/usr/sbin/update-catalog is in sgml-base 1.26+nmu1ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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## ----------------------------------------------------------------------
## Debian GNU/Linux update-catalog version 0.2
## ----------------------------------------------------------------------
## Copyright (c) 2001-2004 Ardo van Rangelrooij
##
## This is free software; see the GNU General Public Licence version 2
## or later for copying conditions. There is NO warranty.
## ----------------------------------------------------------------------
## ----------------------------------------------------------------------
use strict;
## ----------------------------------------------------------------------
$0 =~ m|[^/]+$|;
## ----------------------------------------------------------------------
use vars qw( $name );
$name = $&;
## ----------------------------------------------------------------------
use vars qw( $add );
use vars qw( $backup );
use vars qw( $catalog );
use vars qw( @data );
use vars qw( $debug );
use vars qw( $entry );
use vars qw( $quiet );
use vars qw( $remove );
use vars qw( $super );
use vars qw( $template );
use vars qw( $type );
## ----------------------------------------------------------------------
while ( $ARGV[0] =~ m/^--/ )
{
$_ = shift( @ARGV );
last if $_ eq '--';
if ( $_ eq '--add' )
{
$add = 1;
}
elsif ( $_ eq '--remove' )
{
$remove = 1;
}
elsif ( $_ eq '--quiet' )
{
$quiet = 1;
}
elsif ( $_ eq '--super' )
{
$super = 1;
}
elsif ( $_ eq '--test' )
{
$debug = 1;
}
elsif ( $_ eq '--help' )
{
&help;
exit -1;
}
elsif ( $_ eq '--version' )
{
&help;
exit -1;
}
else
{
print STDERR "$name: unknown option \`$_'\n";
&help;
exit 1;
}
}
## ----------------------------------------------------------------------
if ( ! @ARGV )
{
print STDERR "\n";
&help;
exit 1;
}
## ----------------------------------------------------------------------
if ( $add || $remove )
{
if ( $super )
{
$catalog = '/etc/sgml/catalog';
}
else
{
$catalog = shift( @ARGV );
}
}
## ----------------------------------------------------------------------
if ( ! @ARGV )
{
print STDERR "\n";
&help;
exit 1;
}
## ----------------------------------------------------------------------
$entry = shift( @ARGV );
## ----------------------------------------------------------------------
if ( @ARGV )
{
print STDERR "$name: too many arguments\n";
&help;
exit 1;
}
## ----------------------------------------------------------------------
if ( $add == $remove )
{
print "Huh? You have to use --add or --remove (not both).\n";
exit 1;
}
## ----------------------------------------------------------------------
print STDERR "$name: test mode - catalog file will not be updated\n"
if $debug && ! $quiet;
## ----------------------------------------------------------------------
if ( $add )
{
print "Adding entry $entry to catalog $catalog...\n"
unless $quiet;
&read_catalog_without_entry;
&add_entry;
&write_catalog;
}
elsif ( $remove )
{
print "Removing entry $entry from catalog $catalog...\n"
unless $quiet;
&read_catalog_without_entry;
&write_catalog;
}
## ----------------------------------------------------------------------
exit 0;
## ----------------------------------------------------------------------
sub read_catalog_without_entry
{
if ( -f $catalog )
{
print "Reading catalog $catalog and removing entry $entry...\n"
if $debug;
open( CATALOG, "<$catalog" )
or die "cannot open catalog $catalog for reading: $!";
while ( <CATALOG> )
{
chop;
push( @data, $_ ) unless m/$entry/;
}
close( CATALOG );
}
else
{
$type = $super ? 'super' : 'centralized';
$template = "/usr/share/sgml-base/catalog.$type";
print "Reading template $template...\n"
if $debug;
open( TEMPLATE, "<$template" )
or die "cannot open template $template for reading: $!";
while ( <TEMPLATE> )
{
chop;
s|CATALOG|$catalog| if m/CATALOG/;
push( @data, $_ );
}
close( TEMPLATE );
}
}
## ----------------------------------------------------------------------
sub add_entry
{
print "Appending entry $entry...\n" if $debug;
push( @data, "CATALOG $entry" );
}
## ----------------------------------------------------------------------
sub write_catalog
{
$backup = $catalog . '.old';
if ( not $debug )
{
if ( -f $catalog )
{
# remove old backup file
if ( -f $backup )
{
unlink( $backup )
or die "cannot remove backup copy $backup: $!";
}
rename( $catalog, $backup )
or die "cannot rename $catalog to $backup: $!";
}
open( CATALOG, ">$catalog" )
or die "cannot open catalog $catalog for writing: $!";
for ( @data ) { print CATALOG "$_\n"; };
close( CATALOG );
}
else
{
print "Writing new entry to $catalog...\n";
for ( @data ) { print "$_\n"; };
}
}
## ----------------------------------------------------------------------
sub help
{
print STDERR <<END;
Usage:
$name <options> --add --super <centralized_catalog>
$name <options> --add <centralized_catalog> <ordinary_catalog>
or
$name <options> --remove --super <centralized_catalog>
$name <options> --remove <centralized_catalog> <ordinary_catalog>
Options:
--quiet be quiet
--test do not modify any files, enables debugging mode
--version display version number
--help display this text
END
}
## ----------------------------------------------------------------------
sub version
{
print "Debian $name version 0.2\n";
}
## ----------------------------------------------------------------------
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