cutmp3, as the name implies is a simple command line tool to edit and cut MP3 files without loosing any quality. cutmp3 can edit the mp3 files interactively or selection (start time and end time) can be provided from the command line or even better can be used with a timetable fiile specifiying different start/end times from the same MP3 files.
xclip is a command line interface to the X11 selections (X11 clipboard). It can also be used for copying files, as an alternative to sftp/scp, thus avoiding password prompts when X11 forwarding has already been setup. xclip reads from Standard Input or from one or more files and copy it to the X11 clipboard making it available to the X applications.