Strange crontab-problem

From: Joachim Smit (joachimsmit_at_yahoo.com)
Date: 10/10/05

  • Next message: John L Fjellstad: "Re: 2.6.12 and 2.6.13 won't access cdrom" 
    Date: Mon, 10 Oct 2005 10:43:57 -0700 (PDT)
To: debian-user@lists.debian.org

    Because some naughty boys try to get in one of my
    clients' Debian-server a couple of hundred times a day
    I decided to shut down sshd when I don't need. With a
    simple mechanisme I can start sshd from distance
    whenever I want.

    Just in case I might forget to close it when I'm
    ready, I run the following script 4 times a day:

    ================

    #!/bin/sh

    DATE="/bin/date"
    DATUM=$($DATE +"%Y-%m-%d-%H:%M")
    SUBJECT="HOL/"$DATUM

    AANTAL=`ps -ef | /bin/grep '/usr/sbin/sshd' |
    /usr/bin/wc -l`

    if [ $AANTAL -ne 0 ] ; then

      /etc/init.d/ssh stop
      /usr/bin/mail joachimsmit@yahoo.com -s $SUBJECT <
    /usr/local/sbin/txt/uittekst
      
    fi

    ==========================

    The strange thing is that when I run the script
    interactive, it doesn't try to shut down sshd when
    it's not active.

    But when I call the script from crontab it ALWAYS
    sends me an email, in other words, $AANTAL is always
    greater than 0. When I echo the value of $AANTAL I see
    that running from crontab it is always 1, running the
    script interactive it is always 0 (if sshd is not
    active)

    Why is there a difference between interactive and
    cron?

    Kind regards,

    Joachim

                    
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