Batch update Apple Keychain passwords using terminal
This should be possible with security(1).
The command should like something like this:
security add-generic-password -a 10.18.124.1 -w "newpw" -j "Password Updated 2017-05-17 12:04" -U
-
-aSpecify account name (required) -
-wSpecify password to be added -
-jSpecify comment string (optional) -
-UUpdate item if it already exists
I don't think there is a "contains" feature so you maybe have to loop this.