> On Sun, Nov 8, 2009 at 5:25 AM, Chet Ramey <chet.ra...@case.edu> wrote:
> non-interactive shells don't have job control enabled by default. Are you saying > you ran a script in which you enabled job control, ran a job, turned job control off, > then killed the job? > Bash and historical versions of sh report the status of jobs in a script > that exit as the result of being killed by a signal. I'm not going to > change that. Chet, Revisited. The previous reply to your example works fine for interactive shell. But for a script (non-interactive shell), the example does not work the same. Job status are always reported even with "set +m" in the script. ... Running the examples you gave in a "script" slightly enhanced to use "ps" to show the processes with the following script. $ cat /tmp/a1 #!/bin/bash sleep 60 & P=$! /bin/ps Tfo "pid ppid command" set -m echo "\$-="$- kill $P /bin/ps Tfo "pid ppid command" sleep 60 & P=$! /bin/ps Tfo "pid ppid command" set +m echo "\$-="$- kill $P /bin/ps Tfo "pid ppid command" 1) Case 1. Without patch. $ /tmp/a1 PID PPID COMMAND 25048 25047 -bash 25774 25048 \_ /bin/bash /tmp/a1 25775 25774 \_ sleep 60 25776 25774 \_ /bin/ps Tfo pid ppid command $-=hmB PID PPID COMMAND 25048 25047 -bash 25774 25048 \_ /bin/bash /tmp/a1 25777 25774 \_ /bin/ps Tfo pid ppid command /tmp/a1: line 8: 25775 Terminated sleep 60 PID PPID COMMAND 25048 25047 -bash 25774 25048 \_ /bin/bash /tmp/a1 25778 25774 \_ sleep 60 25779 25774 \_ /bin/ps Tfo pid ppid command $-=hB PID PPID COMMAND 25048 25047 -bash 25774 25048 \_ /bin/bash /tmp/a1 25780 25774 \_ /bin/ps Tfo pid ppid command /tmp/a1: line 16: 25778 Terminated sleep 60 2) Case 2. With patch applied. "set +m" no longer reports job killed. $ /tmp/a1 PID PPID COMMAND 25048 25047 -bash 26242 25048 \_ /bin/bash /tmp/a1 26243 26242 \_ sleep 60 26244 26242 \_ /bin/ps Tfo pid ppid command $-=hmB PID PPID COMMAND 25048 25047 -bash 26242 25048 \_ /bin/bash /tmp/a1 26245 26242 \_ /bin/ps Tfo pid ppid command /tmp/a1: line 8: 26243 Terminated sleep 60 PID PPID COMMAND 25048 25047 -bash 26242 25048 \_ /bin/bash /tmp/a1 26246 26242 \_ sleep 60 26247 26242 \_ /bin/ps Tfo pid ppid command $-=hB PID PPID COMMAND 25048 25047 -bash 26242 25048 \_ /bin/bash /tmp/a1 26248 26242 \_ /bin/ps Tfo pid ppid command Is there another alternative to do this? "disown" would not work for situation where "wait" is used to wait for child to finish ... sleep 80 & P=$! disown $P # this would not work for 'wait' command next (sleep 2; kill $P) & wait $P Thanks, Jeff
