---
name: "nydiff"
section: "1"
platform: "linux"
package: "nypatchy"
version: "20061220+dfsg3-4.4"
release: "Debian 10 (Buster)"
platforms: ["linux"]
url: "https://new.carta.tech/nydiff"
---

# nydiff(1)

tool to compare two versions of a specialized-format patch

## NAME

nydiff - tool to compare two versions of a specialized-format patch

## SYNOPSIS

**nydiff** *oldpam newpam name options* \[ *print* \] \[ .go \]

## DESCRIPTION

**nydiff** is a tool in the Nypatchy suite of programs for working with Patchy Master Files (PAM files); see [**nypatchy**(1)](/nypatchy/1.md).  Specifically, it compares two different versions of the same PAM file and generates a "correction patch" that can be used by **nypatchy** to update the older version to the newer version.

## USAGE

The parameter *oldpam* is the name of the older version of the PAM file (a default extension of ".car" is assumed), *newpam* is the name of the newer version, *print* is the output file to write to (the default is standard output if omitted), and *options* is a sequence of single-character flags.  The parameter *name* is the name to be used for the correction file to be generated (the specific filename will be *name*.ucra for a correction patch to be used by Nypatchy).

The command should be ended with ".go" unless one wants to enter the Nypatchy interactive shell.

## OPTIONS

Note that options should be given as a single string of characters with no space separation and no use of the - character (except that it can be used in place of the options field if no options are desired). Alphabetic options are not case-sensitive.

- A

  "anyway" - Bypass the first sanity check on sufficient matching.

- F

  "force" - Bypass the second sanity check on sufficient matching.

- H

  Print help information only.

## SEE ALSO

[**fcasplit**(1)](/fcasplit/1.md), [**nycheck**(1)](/nycheck/1.md), [**nyindex**(1)](/nyindex/1.md),  [**nylist**(1)](/nylist/1.md), [**nymerge**(1)](/nymerge/1.md), [**nypatchy**(1)](/nypatchy/1.md), [**nyshell**(1)](/nyshell/1.md),  [**nysynopt**(1)](/nysynopt/1.md), [**nytidy**(1)](/nytidy/1.md), [**yexpand**(1)](/yexpand/1.md)

The reference manual for the Nypatchy suite of programs is available in compressed PostScript format at the following URL:\
 *http://wwwasdoc.web.cern.ch/wwwasdoc/psdir/p5refman.ps.gz*

Running the command "nydiff help .no" also gives some brief help on usage.

## AUTHOR

This manual page was written by Kevin McCarty \<kmccarty@debian.org\> for the Debian GNU/Linux system (but may be used by others).  It is licensed under the GNU General Public License, version 2 or later (at your choice).

## COPYRIGHT

Copyright (C) Kevin B. McCarty, 2008.