DBM\_Filter::null(3pm) Perl Programmers Reference Guide DBM\_Filter::null(3pm)

# [NAME](#NAME)

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

# [SYNOPSIS](#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](#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](#SEE_ALSO)

DBM\_Filter, perldbmfilter

# [AUTHOR](#AUTHOR)

Paul Marquess pmqs@cpan.org

2026-08-31 perl v5.44.0

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Document: DBM_Filter::null(3pm) from perl 5.44.0-r1 (Chainguard OS)
Source: https://github.com/Perl/perl5.git