---
name: "deweb"
section: "1"
platform: "linux"
package: "texlive-doc"
version: "2026.1-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/deweb"
---

# deweb(1)

strips away C & CWEB commands from CWEB sources

## NAME

deweb - strips away C & CWEB commands from CWEB sources

## SYNOPSIS

**deweb** \[ **file1 file2 ...** \]

## DESCRIPTION

*deweb* filters away all C & CWEB commands from a CWEB source code. This leaves only the *LaTeX* code. This stripped code, in turn, may then be passed to a suitable syntax checker for LaTeX, like *ChkTeX* and *lacheck,* or spell-checkers like *ispell.*

The *chkweb* tool, included in the  *ChkTeX* distribution will do just this; writing similar scripts should be trivial.

When *deweb* strips away the C code from your CWEB source, it tries to preserve line breaks. This means that the error reports  from *\<your favorite tool\>* will be correct regarding to line numbers. In most cases, the column position will also be correct. This significantly simplifies finding the errors in the *LaTeX* source (in contrast to the output from *cweave,* which output is truly difficult to figure anything out from).

*deweb* accepts a list of filenames on the argument line, and will send its output to *stdout.* If no filenames are given, it will read from stdin, acting as a filter. No options are currently accepted.

Macho users may try to pipe the output from *deweb* directly into *LaTeX,* theoretically, this should work. This would ease the debugging of the *LaTeX* code significantly, as when *LaTeX* complains about wrong syntax, you'll be able to find the erroneous line much more easily. Don't expect that the output looks very much like the final one, though.

*deweb* should now understand all correct *CWEB* opcodes. If it complains about not understanding a correct opcode, please inform the author.

## DISTRIBUTION

Copyright (C) 1996 Jens T. Berger Thielemann

This program is free software; you can redistribute it and/or modify it under the terms of the  *GNU General Public License* as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but **WITHOUT ANY WARRANTY;** without even the implied warranty of **MERCHANTABILITY** or **FITNESS FOR A PARTICULAR PURPOSE.** See the *GNU General Public License* for more details.

You should have received a copy of the  **GNU General Public License** along with this program; if not, write to the *Free Software Foundation, Inc.,* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

## ENVIRONMENT

No environment variables are used.

## FILES

None.

## AUTHOR

Jens T. Berger Thielemann, *\<jensthi@ifi.uio.no\>*

## SEE ALSO

**[cweave(1)](/cweave/1.md), [perl(1)](/perl/1.md), chktex, [lacheck(1)](/lacheck/1.md), [ispell(1)](/ispell/1.md)**

## BUGS

Doesn't even **compile** under *Perl* versions before perl v5. Unfortunately, this means that we can't even tell the user why we failed; *Perl* will just complain about not being able to compile the regexps.

The program will try to swallow the whole input file at once, instead of processing it on a line-by-line basis.