This gem is a library to interact with the CONTENTdm Catcher web service. You can use pitcher to do bulk updating of metadata by using a CSV.
$ gem install pitcher
pitcher -csv ~/pitcher/items.csv -settings ~/pitcher/settings.yml
On the command line you provide a csv file formatted like this:
cdmnumber,field,value,collection,action
0,rights,InC,catchter,edit
1,rights,InC,catchter,edit
2,rights,InC,catchter,edit
and a settings file with your CONTENTdm credentials:
---
cdmurl: http://contentdmurl:81
username: myusername
password: mypassword
license: contentdm-license-number