*Man kill*.txt

ARGUMENTS
       The list of processes to be signaled can be a mixture of names and pids.

       pid    Each pid can be one of four things:

              n      where n is larger than 0.  The process with pid n is signaled.

              0      All processes in the current process group are signaled.

              -1     All processes with a pid larger than 1 are signaled.

              -n     where  n is larger than 1.  All processes in process group n are signaled.  When an argument of the form '-n' is given, and it is meant to denote a
                     process group, either a signal must be specified first, or the argument must be preceded by a '--' option, otherwise it will be taken as the signal
                     to send.

       name   All processes invoked using this name will be signaled.