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Thread: SH and Crontab Schedule Trouble

  1. #1
    Join Date
    Feb 2008
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    102

    Unhappy SH and Crontab Schedule Trouble

    Greetings everyone...
    Seems I already follow the good instruction given
    by the thread from the previous thread located at our
    ubuntu forum. But unfortunately my crontab seems doesnt execute
    my SH.

    My purpose was setting it to be executed at the night time
    day changed.

    Please take a look,
    and revise it,,,


    FileName: backupScript.sh
    #!/bin/sh
    tarikh=""$(date +%F_%R);
    nama="crm_";
    fileHasil=""$nama$tarikh.tar.bz;
    targetLoc="/usr/share/myPlace/backup/";
    targetWeb="/var/www/myWeb/";
    echo "Processing Backup for $tarikh";
    echo "Backing up in progress...";
    tar cvjf $targetLoc$fileHasil $targetWeb;
    echo "Backed up Success! Saved on $targetLoc$fileHasil";
    so at the crontab I did;

    Code:
    $> crontab -e
    and I entered this:

    Code:
    0 0 * * * /usr/share/myPlace/backupScript.sh
    Done!
    I check it via command

    Code:
    $> crontab -l
    Everything seems okay.
    But, why there's no the end result for this?
    The more strange is,
    If i do executing the SH file manually without CRON,
    it is okay, no problem. But once I used it with CRON, no-one execute it.


    My Reference:
    Last edited by jaya28inside; September 9th, 2010 at 11:47 AM. Reason: why is a simple question that lead us to many answers

  2. #2
    Join Date
    May 2007
    Location
    UK near Bedford
    Beans
    3,476
    Distro
    Ubuntu Development Release

    Re: SH and Crontab Schedule Trouble

    No expert here but my experience is that this sort of error is normally to do with different environments. Make sure that all your path names, including those to executables are full/complete and that access rights are O.K as well.
    PC

    To get a terminal command to put its output into a file use this format
    {terminal command} > {filename}

  3. #3
    Join Date
    Apr 2010
    Beans
    129
    Distro
    Ubuntu 10.04 Lucid Lynx

    Re: SH and Crontab Schedule Trouble

    Agree with Peter09.

    You are using unqualified versions of the commands, but cron does not execute in your environment and therefore needs the fully-qualified names.

    For example, you refer to tar, but if you enter the command
    which tar

    you will find that the fully-qualified name is
    /bin/tar

    Therefore, you need to change your references to echo and tar. Cron just can't find them the way you have specified.

    You missed this important warning in your first reference link...

    First, the environment must be defined. If the shell line is omitted, cron will use the default, which is sh. If the PATH variable is omitted, no default will be used and file locations will need to be absolute.
    Last edited by bredman; September 9th, 2010 at 10:51 AM.

  4. #4
    Join Date
    Feb 2008
    Beans
    102

    Wink Re: SH and Crontab Schedule Trouble

    Thanks peter09, yes I'm also not the expert here.
    Anyway, permission case.
    Hmm... I did already giving the backup directory
    to be written and read by everyone. User, group, and all can write/read
    that location...

    Well, bredman ... "references"?

    hold on, let me see...
    at the time I check the Path and Shell reference
    is pointing to the default one, seems okay.

    Here the command to check;

    Code:
    $> cat /etc/crontab
    and the content is of course default;

    SHELL=/bin/sh
    PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
    so, is there any
    another suggestion?
    Last edited by jaya28inside; September 9th, 2010 at 11:20 AM. Reason: still looking for an answer

  5. #5
    Join Date
    Apr 2010
    Beans
    129
    Distro
    Ubuntu 10.04 Lucid Lynx

    Re: SH and Crontab Schedule Trouble

    I copied the warning from your first reference link
    http://www.cyberciti.biz/faq/how-do-...-or-unix-oses/

    You can specify a path at the top of the cron file, or you can replace "echo" with "/bin/echo" and replace "tar" with "/bin/tar".

    The basic problem is that even though you have a PATH defined, it is not available to cron.

    Note: please don't use an editor to edit /etc/crontab, always use the command crontab -e
    Last edited by bredman; September 9th, 2010 at 10:52 AM.

  6. #6
    Join Date
    Feb 2008
    Beans
    102

    Re: SH and Crontab Schedule Trouble

    okay2... i follow ur advice bredman,

    those echo command and tar command
    now i change the previous SH file to this one;

    Please revise it.

    file Name: backupScript.sh
    #!/bin/bash
    tarikh=""$(/bin/date +%F_%R);
    nama="crm_";
    fileHasil=""$nama$tarikh.tar.bz;
    targetLoc="/usr/share/myPlace/backup/";
    targetWeb="/var/www/myWeb/";
    /bin/echo "Processing Backup for $tarikh";
    /bin/echo "Backing up in progress...";
    /bin/tar cvjf $targetLoc$fileHasil $targetWeb;
    /bin/echo "Backed up Success! Saved on $targetLoc$fileHasil";
    Another strange thing again happened.
    The tar seems doing something.
    At the time I check it at backup directory
    I found there is a single result... but unforunately,
    it didn't do compressing perfectly, it just got a few bytes only.
    Actuall target should be more than a few bytes, it should be a MEGA BYTES.

    gosh. Is there any other thing Forgotten?
    Last edited by jaya28inside; September 9th, 2010 at 11:33 AM. Reason: still curious

  7. #7
    Join Date
    Apr 2010
    Beans
    129
    Distro
    Ubuntu 10.04 Lucid Lynx

    Re: SH and Crontab Schedule Trouble

    It looks like your cron problems are fixed, but you now have scripting problems.

    Have you tried to execute the script from the command line to make sure it works correctly?

    I suggest you add diagnostics to your cron script to dump all variables to a file, for example
    /bin/echo $fileHasil >> /var/log/mylog.txt

    I am very suspicious about the assignment to tarikh. To add the results of date to the variable, you should enclose it in reverse quotes.
    tarikh=$(`/bin/date`+%F_%R);

  8. #8
    Join Date
    Feb 2008
    Beans
    102

    Re: SH and Crontab Schedule Trouble

    hello again bredman,
    I just returned from holiday 2 days...

    okay, now let's continue this discussion.

    I'm using single quotes at the /bin/date command I used
    And the result was fine. The date and time were obtained.
    If you're asking me to execute it manually via command.
    Of course no problem. I used
    $> ./backupScript.sh
    and everything run smoothly. Executed and result obtained there.
    The missing thing is that
    It can't be proceed by crontab scheduler.
    my crontab seems never call it.

    o yeah, the dump that you request on
    here's the result;

    Processing Backup for 2010-09-13_10:34
    see? it's working, if only i manually execute it.
    sigh... ooo gosh.
    probably either crontab or my scripting probs.

    Anyway why bredman, you just said to me using reverse quote instead of single quote?

    what are the other possibility which I may forgot?
    Last edited by jaya28inside; September 13th, 2010 at 03:46 AM. Reason: lack of sleep

  9. #9
    Join Date
    Feb 2008
    Beans
    102

    Re: SH and Crontab Schedule Trouble

    for this purpose I change my crontab with this one
    * * * * * /usr/share/myPlace/backupScript.sh
    now I'm hoping it's executing every minutes...

    aha! Yes!
    I knew it now... bredman!
    I got it, what should I do is omit the VERBOSE mode from tar command.
    Now everything is fine. crontab execute it!

    I'm glad this is done now.
    Last edited by jaya28inside; September 13th, 2010 at 04:09 AM. Reason: phew! just because of a single thing... everything could be changed.

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