Jason Schoon writes:

Here is a patch for kill that I posted long ago, but forgot about
until today.  This allows kill to specify a negative process/group
(such as -1).  The shell already had this fix applied by Vodz some
time ago.

diff --git a/procps/kill.c b/procps/kill.c
index 25a8d012467ac86cde9c236bf07ee4078663c6c3..6d7f083b8ae901d5f5819e5424a0767db959d574 100644 (file)
--- a/procps/kill.c
+++ b/procps/kill.c
@@ -111,7 +111,7 @@ do_it_now:
                while (--argc >= 0) {
                        int pid;
 
-                       if (!isdigit(**argv))
+                       if (!isdigit(**argv) && **argv != '-')
                                bb_error_msg_and_die( "Bad PID '%s'", *argv);
                        pid = strtol(*argv, NULL, 0);
                        if (kill(pid, signo) != 0) {