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AT&T UNIX, SCO UnixWare, Sun Microsystems Solaris, HP-UX, IBM AIX, SGI IRIX and many big corporations who wanted license and profit from their own versions of Unix are not as common today as they were in the 1980s.
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viewperl(1) [debian man page]

VIEWPERL(1)							   User Commands						       VIEWPERL(1)

NAME
viewperl - quickly view syntax highlighted Perl code SYNOPSIS
viewperl [OPTION]... FILE... DESCRIPTION
View a Perl source code file, syntax highlighted. -c, --code=CODE view CODE, syntax highlighted -l, --lines display line numbers -L, --no-lines supress display of line numbers (default) -m, --module=FILE consider FILE the name of a module, not a file name -n, --name display the name of each file (default) -N, --no-name supress display of file names (implied by --no-reset) -p, --pod display inline POD documentation (default) -P, --no-pod hide POD documentation (line numbers still increment) -r, --reset reset formatting and line numbers each file (default) -R, --no-reset supress resetting of formatting and line numbers -s, --shift=WIDTH set tab width (default is 4) -t, --tabs translate tabs into spaces (default) -T, --no-tabs supress translating of tabs into spaces --help display this help and exit Note that module names should be given as they would appear after a Perl `use' or `require' statement. `Getopt::Long', for example. Each string given using -c is considered a different file, so line number and formatting resets will apply. View a Perl source code file, syntax highlighted. -c, --code=CODE view CODE, syntax highlighted -l, --lines display line numbers -L, --no-lines supress display of line numbers (default) -m, --module=FILE consider FILE the name of a module, not a file name -n, --name display the name of each file (default) -N, --no-name supress display of file names (implied by --no-reset) -p, --pod display inline POD documentation (default) -P, --no-pod hide POD documentation (line numbers still increment) -r, --reset reset formatting and line numbers each file (default) -R, --no-reset supress resetting of formatting and line numbers -s, --shift=WIDTH set tab width (default is 4) -t, --tabs translate tabs into spaces (default) -T, --no-tabs supress translating of tabs into spaces --help display this help and exit Note that module names should be given as they would appear after a Perl `use' or `require' statement. `Getopt::Long', for example. Each string given using -c is considered a different file, so line number and formatting resets will apply. viewperl August 2007 VIEWPERL(1)

Check Out this Related Man Page

Perl::Critic::Policy::CodeLayout::ProhibitHardTabs(3pm) User Contributed Perl DocumentationPerl::Critic::Policy::CodeLayout::ProhibitHardTabs(3pm)

NAME
Perl::Critic::Policy::CodeLayout::ProhibitHardTabs - Use spaces instead of tabs. AFFILIATION
This Policy is part of the core Perl::Critic distribution. DESCRIPTION
Putting hard tabs in your source code (or POD) is one of the worst things you can do to your co-workers and colleagues, especially if those tabs are anywhere other than a leading position. Because various applications and devices represent tabs differently, they can cause you code to look vastly different to other people. Any decent editor can be configured to expand tabs into spaces. Perl::Tidy also does this for you. This Policy catches all tabs in your source code, including POD, quotes, and HEREDOCs. The contents of the "__DATA__" section are not examined. CONFIGURATION
Hard tabs in a string are always forbidden (use " " instead). But hard tabs in a leading position are allowed when they are used to indent code statements, "qw()" word lists, and regular expressions with the "/x" modifier. However, if you want to forbid all tabs everywhere, then add this to your .perlcriticrc file: [CodeLayout::ProhibitHardTabs] allow_leading_tabs = 0 NOTES
Beware that Perl::Critic may report the location of the string that contains the tab, not the actual location of the tab, so you may need to do some hunting. I'll try and fix this in the future. AUTHOR
Jeffrey Ryan Thalhammer <jeff@imaginative-software.com> COPYRIGHT
Copyright (c) 2005-2011 Imaginative Software Systems. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. The full text of this license can be found in the LICENSE file included with this module. perl v5.14.2 2012-06-07 Perl::Critic::Policy::CodeLayout::ProhibitHardTabs(3pm)

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