---
name: "DBM_Filter::null"
section: "3p"
platform: "openbsd"
package: "man"
version: "8.0-current-20261101"
release: "OpenBSD 8.0-current (2026-11-01)"
platforms: ["openbsd"]
url: "https://new.carta.tech/DBM_Filter::null"
---

# DBM\_Filter::null(3p)

filter for DBM\_Filter

## NAME

DBM\_Filter::null - filter for DBM\_Filter

## SYNOPSIS

```
    use SDBM_File; # or DB_File, GDBM_File, NDBM_File, or ODBM_File
    use DBM_Filter ;
    $db = tie %hash, ...
    $db->Filter_Push('null');
```

## DESCRIPTION

This filter ensures that all data written to the DBM file is null terminated. This is useful when you have a perl script that needs to interoperate with a DBM file that a C program also uses. A fairly common issue is for the C application to include the terminating null in a string when it writes to the DBM file. This filter will ensure that all data written to the DBM file can be read by the C application.

## SEE ALSO

DBM\_Filter, perldbmfilter

## AUTHOR

Paul Marquess pmqs@cpan.org