---
name: "cpif"
section: "1"
platform: "linux"
package: "noweb"
version: "2.13-2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/cpif"
---

# cpif(1)

selectively update files

## NAME

cpif - selectively update files

## SYNOPSIS

**cpif** \[**-eq**\|**-ne**\] file ...

## DESCRIPTION

*cpif* is an auxiliary tool for use with  [*notangle*(1)](/notangle/1.md) and [*make*(1)](/make/1.md). *cpif* compares its standard input to each of the named files, overwriting the file if the comparison succeeds or if the named file does not exist. If neither **-eq** or  **-ne** is specified, the default is **-ne**. Typical usage is in the following default rule, suitable for use in a Makefile.\
\
  .nw.h: ; notangle -Rheader $\*.nw \| cpif $\*.h\

## SEE ALSO

[*notangle*(1)](/notangle/1.md)

## VERSION

This man page is from  *noweb* version 2.12.

## AUTHOR

Norman Ramsey, Tufts University. Internet address **Norman.Ramsey@tufts.edu**.\
 Noweb home page at **http://www.cs.tufts.edu/~nr/noweb**.