streeter@theory.lcs.mit.edu (Kenneth B Streeter) (04/09/91)
I'm having problems with trying to do job control in a csh script. I
want to be able to commence a background job (I'm using the &
metacharacter), use it for some request-handling, and then later kill
the backgrounded job.
I'm trying something like the following: (text in brackets is stuff
specific to my application, and not generally necessary)
#!/bin/csh -f
xterm -e "<my-executable>" &
# <processing deleted>
kill %1
The intent with the 'kill' is to kill the backgrounded job (the
xterm). If I do a 'jobs' before the kill, the xterm job is listed as
an active job (Running) under job control with job number [1].
However, the kill statement terminates with "%1: No such process".
What is wrong with my understanding here?
--
Kenneth B. Streeter | ARPA: streeter@im.lcs.mit.edu
MIT LCS, Room NE43-350 | UUCP: ...!uunet!im.lcs.mit.edu!streeter
545 Technology Square | (617) 253-2614 (work)
Cambridge, MA 02139 | (617) 225-2249 (home) chet@odin.INS.CWRU.Edu (Chet Ramey) (04/09/91)
>I'm having problems with trying to do job control in a csh script.
There's no job control in non-interactive shells. This is true of csh,
bash, and ksh.
--
Chet Ramey Internet: chet@po.CWRU.Edu
Case Western Reserve University NeXT Mail: chet@macbeth.INS.CWRU.Edu
``Now, somehow we've brought our sins back physically -- and they're pissed.''pfalstad@phoenix.Princeton.EDU (Paul Falstad) (04/10/91)
streeter@theory.lcs.mit.edu (Kenneth B Streeter) wrote: >I'm having problems with trying to do job control in a csh script. I >want to be able to commence a background job (I'm using the & >metacharacter), use it for some request-handling, and then later kill >the backgrounded job. > xterm -e "<my-executable>" & > # <processing deleted> > kill %1 You can't refer to process with the "%<number>" construct in noninteractive shells in csh; you can only do it when job control is in effect. Really, this should not require job control to be in effect; for example, this script will work fine in zsh, and also in itcsh, I believe. But if you're using an sh-derived shell (sh,ksh,bash,...) this will work fine: xterm -e "foobar" & # ... kill -9 $! I think the only way to do this in csh is to do something like this: xterm -e "foobar" & # ... kill -9 -$$ # end of script where the "kill" kills off the shell and the xterm by killing the whole process group. You're better off not to write the script in csh IMHO. -- Paul Falstad, pfalstad@phoenix.princeton.edu | 10 PRINT "PRINCETON CS" [Your blood pressure just went up.] | 20 GOTO 10 Princeton University would like to apologize to everyone for this article.
mju@mudos.ann-arbor.mi.us (Marc Unangst) (04/11/91)
pfalstad@phoenix.Princeton.EDU (Paul Falstad) writes: > xterm -e "foobar" & > # ... > kill -9 $! Blech. Here, try this: TEMP=/tmp/$$.`whoami` (xterm -e "foobar" &) 2>$TEMP # ... kill -9 `cat $TEMP` -- Marc Unangst | mju@mudos.ann-arbor.mi.us | "Bus error: passengers dumped" ...!hela!mudos!mju |