Must every process group belong to one process session? In otherwords, is process group a concept which exists only within a processsession? Is there a process group which doesn't belong to any process session? Can a process group not have a session id?When a process group has been disowned from a bash shell by thebuiltin command disown, does the process group still exist?do theprocesses originally in the process group still have the same groupid, implying that they still form a process group?
Must every process group belong to one process session?
process;session;process groups