amidi

List MIDI hardware ports

$ amidi -l

$ amidi -p [hw:1,0,0] -s [file.syx]

$ amidi -p [hw:1,0,0] -r [output.syx]

$ amidi -p [hw:1,0,0] -d

$ amidi -p [hw:1,0,0] -S "F0 43 10 4C 00 00 7E 00 F7"

amidi [-l] [-p port] [-s file] [-r file] [-d] [-S hex]

amidi is an ALSA utility for sending and receiving raw MIDI data. It works at the byte level, making it suitable for sending system exclusive (SysEx) messages, firmware updates to MIDI devices, or capturing MIDI dumps.
Unlike higher-level MIDI sequencers, amidi doesn't interpret MIDI timing or song structure; it transfers raw data to and from hardware ports.

-l, --list-devices

List available hardware MIDI ports

MIDI port to use (e.g., hw:1,0,0)

Send contents of file to port

Receive data and write to file

Send hexadecimal bytes

Print received data as hex

Timeout for receive operations

Don't ignore active sensing messages

Works only with hardware MIDI ports, not virtual/software ports. SysEx transfers can be large and slow. Some devices require specific timing between messages.

amidi is part of the ALSA utilities, providing low-level MIDI access since ALSA replaced OSS in the Linux kernel in the early 2000s.

aconnect(1), aplaymidi(1), arecordmidi(1)