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  • at warning: commands will be executed using /bin/s

    http://www.linuxquestions.org/questions/linux-general-1/at-warning-commands-will-be-executed-using-bin-s-491520/

      #1
    RGummi
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    Registered: Nov 2005
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    at - warning: commands will be executed using /bin/s


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    Hello,

    is there a way to switch off the stupid output of at "warning: commands will be executed using /bin/s"? I have tried to send the stderr output to /dev/null, this works but the text with the job number is also send to /dev/null! So I'am looking for a switch to tell at that I dont'need this warning!

    Thanks
    R
     

    RGummi
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    Old 10-12-2006, 07:32 AM  #2
    druuna
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    Registered: Sep 2003
    Location: the Netherlands
    Distribution: lfs
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    Hi,

    You need to tell at which shell to use (/bin/s is not a valid shell, you should look into this!)

    Use one of the following to tell at which shell to use (if present):
    -c C shell. csh(1) is used to execute the at-job.
    -k Korn shell. ksh(1) is used to execute the at-job.
    -s Bourne shell. sh(1) is used to execute the at-job.

    If you do not use one of the above the value of the SHELL variable will be used (which probably points to /bin/s, which is incorrect).

    man at for details.

    Hope this helps.
     

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    Old 10-12-2006, 12:01 PM  #3
    RGummi
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    Registered: Nov 2005
    Posts: 90

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    Hi,

    yes you are right! It says "warning: commands will be executed using /bin/sh"
    I have tried at -s but it says -s is an invalid option. man at does not say anything about -s, -c -k option.

    at -V says
    at version 3.1.8


    R
     

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    Old 10-12-2006, 01:58 PM  #4
    haertig
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    Registered: Nov 2004
    Distribution: Debian, Ubuntu, Slackware, Slax, Knoppix, SysrescueCD
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    Here's how I'd do it:
    Code:
    $ echo 'echo hello >/dev/null' | at now + 2 min >/dev/null 2>&1
    This command creates the at job, silently.

    Then come back later to investigate what you need:
    Code:
    $ at -l
    $ at -c <jobnumber>
    $ atrm <jobnumber>
    The first command lists all your current at jobs (jobnumber and time of execution)
    The second shows the details of a specific jobnumber
    The third deletes a specific jobnumber

    [edit]

    p.s. - If you want a one-liner that mimics what you are asking to do, here's one:
    Code:
    echo "echo hello > /dev/null" | at now + 2 min 2>/dev/null; at -l | tail -n1
    [/edit]

    Last edited by haertig; 10-12-2006 at 02:01 PM.
     

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    Old 10-13-2006, 12:34 PM   #5
    RGummi
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    Registered: Nov 2005
    Posts: 90

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    Hi,

    thanks!

    now I do the following:

    echo $cmd | at $time $date 2>&1 | tail -n 1

    this is perfect!

    RGummi
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  • 原文地址:https://www.cnblogs.com/lexus/p/1833426.html
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