| SPAWN under Unix question [message #20981] |
Thu, 03 August 2000 00:00 |
Paul van Delst
Messages: 364
Registered: March 1997
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Senior Member |
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Hey there,
I want to execute some system commands (cp, tar, rm) using SPAWN on a
Linux system. Does IDL execution suspend while the OS command is
executing? The reason I ask is my IDL code copies some files, tar's them
up, then deletes the files. If the spawn works in the background, things
can get quite muddled.
The documentation states:
"If Command is not present, SPAWN starts an interactive command
interpreter process. Under UNIX, the default shell is used. IDL
execution suspends until the new shell process terminates. Under UNIX,
shells that handle process suspension (e.g., /bin/csh) offer a more
efficient way to get the same effect."
but it doesn't say what happens if "command" is not present.
TIA
paulv
p.s. I really should pull my finger out and learn Perl, but IDL is so
easy to use.....
--
Paul van Delst Ph: (301) 763-8000 x7274
CIMSS @ NOAA/NCEP Fax: (301) 763-8545
Rm.202, 5200 Auth Rd. Email: pvandelst@ncep.noaa.gov
Camp Springs MD 20746
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| Re: SPAWN under Unix question [message #21075 is a reply to message #20981] |
Thu, 03 August 2000 00:00  |
Craig Markwardt
Messages: 1869
Registered: November 1996
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Senior Member |
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Yes, IDL execution is suspended when you run a command via SPAWN.
*Unless* you use the UNIT keyword, *or* you explicitly put the command
in the background by using "&" in the command line.
Craig
Paul van Delst <pvandelst@ncep.noaa.gov> writes:
> Hey there,
>
> I want to execute some system commands (cp, tar, rm) using SPAWN on a
> Linux system. Does IDL execution suspend while the OS command is
> executing? The reason I ask is my IDL code copies some files, tar's them
> up, then deletes the files. If the spawn works in the background, things
> can get quite muddled.
>
> The documentation states:
>
> "If Command is not present, SPAWN starts an interactive command
> interpreter process. Under UNIX, the default shell is used. IDL
> execution suspends until the new shell process terminates. Under UNIX,
> shells that handle process suspension (e.g., /bin/csh) offer a more
> efficient way to get the same effect."
>
> but it doesn't say what happens if "command" is not present.
>
> TIA
>
> paulv
>
> p.s. I really should pull my finger out and learn Perl, but IDL is so
> easy to use.....
> --
> Paul van Delst Ph: (301) 763-8000 x7274
> CIMSS @ NOAA/NCEP Fax: (301) 763-8545
> Rm.202, 5200 Auth Rd. Email: pvandelst@ncep.noaa.gov
> Camp Springs MD 20746
--
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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@cow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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