Stripping out stuff in filenames.

[C E Macfarlane]

>     I use GiP to get radio programmes to listen to from my phone whilst
>     driving. I often get filenames like this
>     "Radcliffe_and_Maconie_-_Richard_Osman_and_Alexander_Armstrong
>     _b06djgf4_default.m4a,
>     far too long for my phone screen. Is there a way to strip out the
>     "_b06djgf4_default." part, either as a global thing or as part of the
>     command? I use GiP on Linux using the cli.

Why not use the --file-prefix parameter?  Why not use the --help
or --helplong parameter to find this out?