wes@uh.msc.umn.edu (Wes Barris) (09/21/90)
I have a "c" program that returns an integer value. How does one run this
program from within a csh script and access the returned value? I have
tried various forms of the following lines with no luck.
#!/bin/csh
#
# NOTE: WF_DIR is an environment variable.
#
set intro_data = "data"
@ nobjs = `"$WF_DIR/lbin/read_intro $intro_data"`
When run, this script yields the following error message on a Sun4-280:
/usr/local/wave/lbin/read_intro data: Command not found.
If I change the csh line to the following, it runs properly but does not
(of course) return the integer value.
$WF_DIR/lbin/read_intro $intro_data
Does anyone know what's the deal?
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o _____ |Wes Barris | | wes@msc.edu |
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God helps them that help themselves. -- Benjamin Franklinables@lot.ACA.MCC.COM (King Ables) (09/22/90)
From article <2629@uc.msc.umn.edu>, by wes@uh.msc.umn.edu (Wes Barris): > I have a "c" program that returns an integer value. How does one run this > program from within a csh script and access the returned value? I have You have two problems. > set intro_data = "data" > @ nobjs = `"$WF_DIR/lbin/read_intro $intro_data"` > > When run, this script yields the following error message on a Sun4-280: > > /usr/local/wave/lbin/read_intro data: Command not found. Problem number 1: If you put the command AND the arguments inside of quotes, then the shell that gets started looks at it as a single token (so it's looking for a command containing a space, which of course, it doesn't find). You don't have to quote the command inside of the grave accents (`). Problem number 2: Grave accents isn't what you want anyway. That will store the OUTPUT of the command in the symbol nobjs, not the exit status. The exit status can be found in the $status symbol. So if your program doesn't generate any output that would confuse the user running the script, you should do something like this: set intro_data = "data" $WF_DIR/lbin/read_intro $intro_data set nobjs = $status THEN nobjs will contain the return code. Take care that you use $status *right after* you run the command. The value changes when the next command is executed. $status always contains the exit status of the most recently executed command. ----------------------------------------------------------------------------- King Ables Micro Electronics and Computer Technology Corp. ables@mcc.com 3500 W. Balcones Center Drive +1 512 338 3749 Austin, TX 78759 ----------------------------------------------------------------------------- We don't inherit the Earth from our parents, we borrow it from our children.
jfrancis@umaxc.weeg.uiowa.edu (Jeff Francis,Home Number,,3540765) (09/22/90)
From article <2629@uc.msc.umn.edu>, by wes@uh.msc.umn.edu (Wes Barris): > I have a "c" program that returns an integer value. How does one run this > program from within a csh script and access the returned value? I have > tried various forms of the following lines with no luck. The value returned from any program is "remembered" in $status. -jpf ------------------------------------- Jeff Francis THINK Class Library Evangelist and CS Student, University of Iowa jfrancis@umaxc.weeg.uiowa.edu -------------------------------------
davidsen@crdos1.crd.ge.COM (Wm E Davidsen Jr) (09/22/90)
I'm not sure if you mean "returns an integer value" as status (in
$status) or prints it out, in which case you run the program in `` to
get the value.
--
bill davidsen (davidsen@crdos1.crd.GE.COM -or- uunet!crdgw1!crdos1!davidsen)
VMS is a text-only adventure game. If you win you can use unix.