---
name: "Catmandu::Fix::marc_set"
section: "3pm"
platform: "linux"
package: "libcatmandu-marc-perl"
version: "1.320-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/Catmandu::Fix::marc_set"
---

# Catmandu::Fix::marc\_set(3pm)

set a marc value of one (sub)field to a new value

## NAME

Catmandu::Fix::marc\_set - set a marc value of one (sub)field to a new value

## SYNOPSIS

```
    # Set a field in the leader
    if marc_match('LDR/6','c')
        marc_set('LDR/6','p')
    end
    # Set a control field
    marc_set('001',1234)
    # Set all the 650-p fields to 'test'
    marc_set('650p','test')
    # Set the 100-a subfield where indicator-1 is 3
    marc_set('100[3]a','Farquhar family.')
    # Copy data from another field in a subfield
    marc_set('100a','$.my.deep.field')
```

## DESCRIPTION

Set the value of a MARC subfield to a new value.

## METHODS

### marc\_set(MARC\_PATH , VALUE)

Set a MARC subfield to a particular new value. This value can be a literal or reference an existing field in the record using the dollar JSON\_PATH syntax.

## INLINE

This Fix can be used inline in a Perl script:

```
    use Catmandu::Fix::marc_set as => 'marc_set';
    my $data = { record => [...] };
    $data = marc_set($data, '245a', 'test');
```

## SEE ALSO

Catmandu::Fix::marc\_add, Catmandu::Fix::marc\_copy, Catmandu::Fix::marc\_cut, Catmandu::Fix::marc\_paste