Provided by: calibre_8.16.2+ds+~0.10.5-2_all 

NAME
calibre-parallel - internal used command by calibre(1)
DESCRIPTION
This is internal used command by calibre(1). There is no needs to invoke this command by hand.
SEE ALSO
calibre(1)
calibre-parallel August 2021 CALIBRE-PARALLEL(1)