```{index} single: DBM_Filter::null ``` # DBM_Filter::null DBM\_Filter::null - filter for DBM\_Filter ## SYNOPSIS ```perl 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](../DBM_Filter.md), [perldbmfilter](https://perldoc.perl.org/perldbmfilter) ## AUTHOR Paul Marquess pmqs@cpan.org