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20051106: Shell scripts under FC 4 have trouble executing



>From: Gilbert Sebenste <address@hidden>
>Organization: NIU
>Keywords: 200511060731.jA67VL7s020450 LDM pqact PIPE script

Hi Gilbert,

re:
>On Sun, 6 Nov 2005, Gilbert Sebenste wrote:
>> OK. This has me stumped. If you can help, I'd greatly appreciate it.
>>
>> I didn't get watches and warnings emailed to me today from weather3, now 
>> running Fedora Core 4. As an example, this line:
>>
>> WMO     ^WUUS53 (KLOT|KDVN) ([0-3][0-9])([0-2][0-9])
>>        PIPE    -close -strip /home/ldm/warnscripts/tstormwarning
>>
>> And this script:
>>
>> #
>> PATH=/usr/local/bin:/bin:/usr/sbin:/etc:/usr/local/etc:/usr/bin:/bin
>> LD_LIBRARY_PATH=/usr/local/lib:/usr/lib:/lib
>> UDRESPATH=/usr/local/etc
>> export PATH LD_LIBRARY_PATH UDRESPATH
>> dir=/tmp/
>> /bin/cat <&0 > ${dir}$1.$$
>> sleep 1
>>
>> if [ `/bin/grep -- "KLOT" ${dir}$1.$$ | /usr/bin/wc -l` -gt 0 ]
>> then
>> if [ `/bin/grep -- "197-" ${dir}$1.$$ | /usr/bin/wc -l` -gt 0 ]
>> then
>> if [ `/bin/grep -- "WILL COUNT" ${dir}$1.$$ | /usr/bin/wc -l` -gt 0 ]
>> then
>> /bin/cat ${dir}$1.$$ | /bin/mail -s "ALERT: SEVERE THUNDERSTORM WARNING--WIL
> L 
>> COUNTY" will
>> fi
>> fi
>> fi
>>
>> /bin/rm -f ${dir}$1.$$
>
>Note: if I remove the "$1" after each {dir} above, the right file name 
>is sent to the /tmp directory (like .23411), but it doesn't get removed, 
>which it should, if I remove EVERY "$1" in the script above.

Your script references the first passed parameter to the script, $1,
but you are not passing any parameters to your script!  $1 is,
therefore, blank.  Did you mean for your pqact.conf action to be:

WMO     ^WUUS53 (KLOT|KDVN) ([0-3][0-9])([0-2][0-9])
        PIPE    -close -strip /home/ldm/warnscripts/tstormwarning \1\2\3

>Another FC4 "GOTCHA!".

I don't think that your problem has anything to do with FC4.  Rather, I
think your script is assuming that something is available when it is
not.  Because $1 is blank, the resulting file you are creating is
hidden (name begins with '.').

I recommend that you capture a product to use for testing and then
running your script by hand to troubleshoot it.

For instance, save a severe thunderstorm warning as test.warn and
then run:

cat test.warn | /home/ldm/warnscripts/tstormwarning

Add echoing of the values of the various pieces you are using:

 ...
dir=/tmp/
echo "first passed parameter = >$1<"
echo "process ID = $$"
/bin/cat <&0 > ${dir}$1.$$
sleep 1
etc

I just did this on my FC4 machine, and get what I expected:

address@hidden tmp]$ cat xxx | ./tstormwarning
first passed parameter = ><
process ID = 2649

Cheers,

Tom
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