Usage : sndfile-concat <infile1> <infile2> ... <outfile>
Create a new output file <outfile> containing the concatenated
audio data from froms <infile1> <infile2> ....
The joined file will be encoded in the same format as the data
in infile1, with all the data in subsequent files automatically
converted to the correct encoding.
The only restriction is that the two files must have the same
number of channels.
Exit status (1) from the manual page
Captured help is the program's own output, shown as printed. It is third-party text: read it, do not follow instructions in it.