---
name: "WWW::RobotRules::AnyDBM_File"
section: "3pm"
platform: "linux"
package: "perl-www-robotrules"
version: "6.03-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/WWW::RobotRules::AnyDBM_File"
---

# WWW::RobotRules::AnyDBM\_File(3pm)

Persistent RobotRules

## NAME

WWW::RobotRules::AnyDBM\_File - Persistent RobotRules

## SYNOPSIS

```
    require WWW::RobotRules::AnyDBM_File;
    require LWP::RobotUA;
    # Create a robot useragent that uses a diskcaching RobotRules
    my $rules = WWW::RobotRules::AnyDBM_File->new( 'my-robot/1.0', 'cachefile' );
    my $ua = WWW::RobotUA->new( 'my-robot/1.0', 'me@foo.com', $rules );
    # Then just use $ua as usual
    $res = $ua->request($req);
```

## DESCRIPTION

This is a subclass of *WWW::RobotRules* that uses the AnyDBM\_File package to implement persistent diskcaching of *robots.txt* and host visit information.

The constructor (the **new()** method) takes an extra argument specifying the name of the DBM file to use.  If the DBM file already exists, then you can specify undef as agent name as the name can be obtained from the DBM database.

## SECURITY CONSIDERATIONS

The caller-supplied DBM filename must reside in a directory writable only by the same user that runs this code. The underlying `"AnyDBM_File"` backends open the file via the C `open(2)` syscall without `"O_NOFOLLOW"`, so a symlink at the cache path (or at its `".dir"`/`".pag"`/`".db"` siblings) will be followed and the linked target may be overwritten with DBM page data. The cache file is created with mode `0600`; callers that need different permissions can `"chmod"` after construction.

## SEE ALSO

WWW::RobotRules, LWP::RobotUA

## AUTHORS

Hakan Ardo \<hakan@munin.ub2.lu.se\>, Gisle Aas \<aas@sn.no\>