The name-string specifies an external program to be called that will automatically change volumes as required by Bacula. Normally, this directive will be specified only in the AutoChanger resource, which is then used for all devices. However, you may also specify the different Changer Command in each Device resource. Most frequently, you will specify the Bacula supplied mtx-changer script as follows:
"/path/mtx-changer %c %o %S %a %d"
and you will install the mtx on your system (found in the depkgs release). An example of this command is in the default bacula-sd.conf file. For more details on the substitution characters that may be specified to configure your autochanger please see the AutochangersAutochangersChapter chapter of this manual. For FreeBSD users, you might want to see one of the several chio scripts in examples/autochangers.
string"/etc/bacula/mtx-changer %c %o %S %a %d"