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gwsw
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Less - text pager

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This is the source code distribution of "less".
This program is part of the GNU project (https://www.gnu.org).

This program is free software.  You may redistribute it and/or
modify it under the terms of either:

1. The GNU General Public License, as published by the Free
   Software Foundation; either version 3, or (at your option) any
   later version.  A copy of this license is in the file COPYING.
or
2. The Less License, in the file LICENSE.

Please report any problems at https://github.com/gwsw/less/issues.
See https://greenwoodsoftware.com/less for the latest info.
Source repository is at https://github.com/gwsw/less.git.

=========================================================================

You should build from a clone of a git repository ONLY IF you are doing development on the less source itself. If you are merely using less as a tool, you should download a release from https://greenwoodsoftware.com and NOT from github.

The formatted manual page is in less.man. The manual page nroff source is in less.nro. Major changes made since the last posted version are in NEWS.

======================================================================= INSTALLATION (Unix & Linux systems only):

  1. Move the distributed source to its own directory and unpack it, if you have not already done so.

  2. If you are building from a clone of a git repository, type "make -f Makefile.aut". If you are building from a numbered release package (a tar or zip file with a name like less-999.tar.gz or less-999.zip downloaded from greenwoodsoftware.com, not from github), you should skip this step.

  3. Type "sh configure". This will generate a Makefile and a defines.h. Warning: if you have a GNU sed, make sure it is version 2.05 or later.

The file INSTALL describes the usage of the configure program in general. In addition, these options to configure are supported:

--with-editor=program Specifies the default editor program used by the "v" command. The default is "vi".

--with-regex=lib Specifies the regular expression library used by less for pattern matching. The default is "auto", which means the configure program finds a regular expression library automatically. Other values are: gnu Use the GNU regex library. pcre Use the PCRE library. pcre2 Use the PCRE2 library. posix Use the POSIX-compatible regcomp. regcmp Use the regcmp library. recomp Use the recomp library. regcomp Use the V8-compatible regcomp. regcomp-local Use Henry Spencer's V8-compatible regcomp (source is supplied with less). none No regular expressions, only simple string matching.

--with-secure Builds a "secure" version of less, with some features disabled to prevent users from viewing other files, accessing shell commands, etc.

  1. It is a good idea to look over the generated Makefile and defines.h and make sure they look ok. If you know of any peculiarities of your system that configure might not have detected, you may fix the Makefile now. Take particular notice of the list of "terminal" libraries in the LIBS definition in the Makefile; these may need to be edited. The terminal libraries will be some subset of -lncurses -lcurses -ltermcap -ltermlib

If you wish, you may edit defines.h to remove some optional features. If you choose not to include some features in your version, you may wish to edit the manual page "less.nro" and the help page "less.hlp" to remove the descriptions of the features which you are removing. If you edit less.hlp, you should run "make -f Makefile.aut help.c".

  1. Type "make" and watch the fun.

  2. If the make succeeds, it will generate the programs "less", "lesskey" and "lessecho" in your current directory. Test the generated programs.

  3. When satisfied that it works, if you wish to install it in a public place, type "make install".

The default install destinations are: Executables (less, lesskey, lessecho) in /usr/local/bin Documentation (less.nro, lesskey.nro) in /usr/local/man/man1 If you want to install any of these files elsewhere, define bindir and/or mandir to the appropriate directories.

Note to hackers: comments noting possible improvements are enclosed in double curly brackets {{ like this }}.

(Note that the above note was originally written at a time when "hackers" most commonly meant "enthusiastic and dedicated computer programmers", not "persons who attempt to circumvent computer security".)

======================================================================= INSTALLATION (MS-DOS systems only, with Microsoft C, Borland C, or DJGPP)

  1. Move the distributed source to its own directory. Depending on your compiler, you may need to convert the source to have CR-LF rather than LF as line terminators.

  2. If you are using Microsoft C, rename MAKEFILE.DSU to MAKEFILE. If you are using Borland C, rename MAKEFILE.DSB to MAKEFILE. If you are using DJGPP, rename MAKEFILE.DSG to MAKEFILE.

  3. Look at MAKEFILE to make sure that the definitions for CC and LIBDIR are correct. CC should be the name of your C compiler and LIBDIR should be the directory where the C libraries reside (for Microsoft C only). If these definitions need to be changed, you can either modify the definitions directly in MAKEFILE, or set your environment variables CC and/or LIBDIR to override the definitions in MAKEFILE.

  4. If you wish, you may edit DEFINES.DS to remove some optional features. If you choose not to include some features in your version, you may wish to edit the manual page LESS.MAN and the help page HELP.C to remove the descriptions of the features which you are removing.

  5. Run your "make" program and watch the fun. If your "make" requires a flag to import environment variables, you should use that flag. If your compiler runs out of memory, try running "make -n >cmds.bat" and then run cmds.bat.

  6. If the make succeeds, it will generate the programs "LESS.EXE" and "LESSKEY.EXE" in your current directory. Test the generated programs.

  7. When satisfied that it works, you may wish to install LESS.EXE and LESSKEY.EXE in a directory which is included in your PATH.

======================================================================= INSTALLATION (Windows-95, Windows-98 and Windows-NT systems only, with Borland C or Microsoft Visual C++)

  1. Move the distributed source to its own directory.

  2. If you are using Borland C, rename Makefile.wnb to Makefile. If you are using Microsoft Visual C++, rename Makefile.wnm to Makefile.

  3. Check the Makefile to make sure the definitions look ok.

  4. If you wish, you may edit defines.wn to remove some optional features. If you choose not to include some features in your version, you may wish to edit the manual page less.man and the help page help.c to remove the descriptions of the features which you are removing.

  5. Type "make" and watch the fun.

  6. If the make succeeds, it will generate the programs "less.exe" and "lesskey.exe" in your current directory. Test the generated programs.

  7. When satisfied that it works, if you wish to install it in a public place, type "make install". See step 6 of the Unix installation instructions for details on how to change the default installation directories.

======================================================================= INSTALLATION (OS/2 systems only, with EMX C)

  1. Move the distributed source to its own directory.

  2. Rename Makefile.o2e to Makefile.

  3. Check the Makefile to make sure the definitions look ok.

  4. If you wish, you may edit defines.o2 to remove some optional features. If you choose not to include some features in your version, you may wish to edit the manual page less.man and the help page help.c to remove the descriptions of the features which you are removing.

  5. Type "make" and watch the fun.

  6. If the make succeeds, it will generate the programs "less.exe" and "lesskey.exe" in your current directory. Test the generated programs.

  7. Make sure you have the emx runtime installed. You need the emx DLLs emx.dll and emxlibcs.dll and also the termcap database, termcap.dat. Make sure you have termcap.dat either in the default location or somewhere in a directory listed in the PATH or INIT environment variables.

  8. When satisfied that it works, you may wish to install less.exe, lesskey.exe and scrsize.exe in a directory which is included in your PATH. scrsize.exe is required only if you use a terminal emulator such as xterm or rxvt.

======================================================================= INSTALLATION (OS-9 systems only, with Microware C or Ultra C)

  1. Move the distributed source to its own directory.

  2. If you are using Microware C, rename Makefile.o9c to Makefile. If you are using Ultra C, rename Makefile.o9u to Makefile.

  3. Check the Makefile to make sure the definitions look ok.

  4. If you wish, you may edit defines.o9 to remove some optional features. If you choose not to include some features in your version, you may wish to edit the manual page less.man and the help page help.c to remove the descriptions of the features which you are removing.

  5. Type "dmake" and watch the fun. The standard OS-9 "make" will probably not work. If you don't have dmake, you can get a copy from os9archive.rtsi.com.

  6. If the make succeeds, it will generate the programs "less" and "lesskey" in your current directory. Test the generated programs.

  7. When satisfied that it works, if you wish to install it in a public place, type "dmake install". See step 6 of the Unix installation instructions for details on how to change the default installation directories.

======================================================================= ACKNOWLEDGMENTS: Some versions of the less distribution are packaged using Info-ZIP's compression utility. Info-ZIP's software is free and can be obtained as source code or executables from various anonymous-ftp sites, including ftp.uu.net:/pub/archiving/zip.

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