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groff
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perl5
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FindBin.pm
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# FindBin.pm # # Copyright (c) 1995 Graham Barr & Nick Ing-Simmons. All rights reserved. # This program is free software; you can redistribute it and/or modify it # under the same terms as Perl itself. =head1 NAME FindBin - Locate directory of original perl script =head1 SYNOPSIS use FindBin; use lib "$FindBin::Bin/../lib"; or use FindBin qw($Bin); use lib "$Bin/../lib"; =head1 DESCRIPTION Locates the full path to the script bin directory to allow the use of paths relative to the bin directory. This allows a user to setup a directory tree for some software with directories C<< <root>/bin >> and C<< <root>/lib >>, and then the above example will allow the use of modules in the lib directory without knowing where the software tree is installed. If perl is invoked using the B<-e> option or the perl script is read from C<STDIN> then FindBin sets both C<$Bin> and C<$RealBin> to the current directory. =head1 EXPORTABLE VARIABLES $Bin - path to bin directory from where script was invoked $Script - basename of script from which perl was invoked $RealBin - $Bin with all links resolved $RealScript - $Script with all links resolved =head1 KNOWN ISSUES If there are two modules using C<FindBin> from different directories under the same interpreter, this won't work. Since C<FindBin> uses a C<BEGIN> block, it'll be executed only once, and only the first caller will get it right. This is a problem under mod_perl and other persistent Perl environments, where you shouldn't use this module. Which also means that you should avoid using C<FindBin> in modules that you plan to put on CPAN. To make sure that C<FindBin> will work is to call the C<again> function: use FindBin; FindBin::again(); # or FindBin->again; In former versions of FindBin there was no C<again> function. The workaround was to force the C<BEGIN> block to be executed again: delete $INC{'FindBin.pm'}; require FindBin; =head1 AUTHORS FindBin is supported as part of the core perl distribution. Please send bug reports to E<lt>F<perlbug@perl.org>E<gt> using the perlbug program included with perl. Graham Barr E<lt>F<gbarr@pobox.com>E<gt> Nick Ing-Simmons E<lt>F<nik@tiuk.ti.com>E<gt> =head1 COPYRIGHT Copyright (c) 1995 Graham Barr & Nick Ing-Simmons. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. =cut package FindBin; use Carp; require 5.000; require Exporter; use Cwd qw(getcwd cwd abs_path); use File::Basename; use File::Spec; @EXPORT_OK = qw($Bin $Script $RealBin $RealScript $Dir $RealDir); %EXPORT_TAGS = (ALL => [qw($Bin $Script $RealBin $RealScript $Dir $RealDir)]); @ISA = qw(Exporter); $VERSION = "1.51"; # needed for VMS-specific filename translation if( $^O eq 'VMS' ) { require VMS::Filespec; VMS::Filespec->import; } sub cwd2 { my $cwd = getcwd(); # getcwd might fail if it hasn't access to the current directory. # try harder. defined $cwd or $cwd = cwd(); $cwd; } sub init { *Dir = \$Bin; *RealDir = \$RealBin; if($0 eq '-e' || $0 eq '-') { # perl invoked with -e or script is on C<STDIN> $Script = $RealScript = $0; $Bin = $RealBin = cwd2(); $Bin = VMS::Filespec::unixify($Bin) if $^O eq 'VMS'; } else { my $script = $0; if ($^O eq 'VMS') { ($Bin,$Script) = VMS::Filespec::rmsexpand($0) =~ /(.*[\]>\/]+)(.*)/s; # C<use disk:[dev]/lib> isn't going to work, so unixify first ($Bin = VMS::Filespec::unixify($Bin)) =~ s/\/\z//; ($RealBin,$RealScript) = ($Bin,$Script); } else { croak("Cannot find current script '$0'") unless(-f $script); # Ensure $script contains the complete path in case we C<chdir> $script = File::Spec->catfile(cwd2(), $script) unless File::Spec->file_name_is_absolute($script); ($Script,$Bin) = fileparse($script); # Resolve $script if it is a link while(1) { my $linktext = readlink($script); ($RealScript,$RealBin) = fileparse($script); last unless defined $linktext; $script = (File::Spec->file_name_is_absolute($linktext)) ? $linktext : File::Spec->catfile($RealBin, $linktext); } # Get absolute paths to directories if ($Bin) { my $BinOld = $Bin; $Bin = abs_path($Bin); defined $Bin or $Bin = File::Spec->canonpath($BinOld); } $RealBin = abs_path($RealBin) if($RealBin); } } } BEGIN { init } *again = \&init; 1; # Keep require happy
/home/sudancam/../../usr/share/groff/../perl5/FindBin.pm