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2014-09-28 10:08 GMT-06:00 <meino.cramer@×××.de>: |
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> |
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> Randolph Maaßen <r.maassen60@×××××.com> [14-09-28 16:24]: |
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>> On Sep 28, 2014 4:14 PM, <meino.cramer@×××.de> wrote: |
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>> > |
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>> > Hi, |
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>> > |
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>> > I want to run programs, which insist on haveing a terminal |
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>> > to write their status to and which are writing files which |
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>> > their results on a headless computer (beaglebone). |
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>> > |
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>> > I tried things like |
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>> > |
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>> > my_program -o file.txt -parameter value > /dev/null &2>&1 & |
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>> > |
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>> > but this results in a idle copy of this process and a defunct |
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>> > child. |
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>> > |
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>> > The program does not use X11 in any way... |
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>> > |
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>> > Is there any neat trick to accomplish what I am trying to do here? |
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>> > |
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>> > Thank you very much in advance for any help! |
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>> > Best regards, |
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>> > mcc |
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>> > |
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>> > |
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>> > |
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>> |
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>> I would suggest to run the program in a screen session, you can disconnect |
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>> frim the session and reconnect later. |
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>> |
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>> http://www.gnu.org/software/screen/ |
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>> |
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>> -- |
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>> Best regards |
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>> Randolph Maaßen |
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> |
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> Hi Randolph, |
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> |
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> ...the headless device will be booted and the programm will be startet |
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> via a kind of autostart script. No human intervention is |
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> wanted/possible... |
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> |
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|
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You can use ">&-" in the script to run the program with stdout closed |
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by default, but this might result in an error if the program relies on |
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stdout open example: |
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--- |
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$ echo "Hello" >&- |
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bash: echo: write error: Bad file descriptor |
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--- |
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but if I do this(stdout and stderr closed): |
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-- |
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$ echo "Hello" 2>&- >&- |
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-- |
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nothing is printed |
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but |
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-- |
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$ echo $? |
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1 |
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-- |
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However if I try to run an application that uses X it starts normally. |
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more info on this stuff on [1] |
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in page 15 it's kind of explained the case of programs running with ">&-" |
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https://www.gnu.org/ghm/2011/paris/slides/jim-meyering-goodbye-world.pdf |
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|
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> Best regards, |
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> mcc |
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> |
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> |
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> |
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