[LDM #LIN-843313]: Question on manually inserting METARs into ldm.pq through a script

Gilbert,

> Got a question for you.
> 
> In case NOAAPort goes out, I want to insert METARs into the ldm queue so
> that GEMPAK can get them. The Aviation Weather Center (AWC) now has a
> fiber backup to get METARs in case NOAAport/AWIPS SBN goes down again.
> I have a script that kind of works...to grab them and insert them into the
> ldm.pq file.The first one runs flawlessly. The next ones do not:
> 
> ldm %/home/ldm/grabawcmetars2 > /dev/shm/awcmetars.txt
> pqinsert ERROR: open: /dev/shm/awcmetars.txt: No such file or directory
> pqinsert ERROR: open: /dev/shm/awcmetars.txt: No such file or directory
> pqinsert ERROR: open: /dev/shm/awcmetars.txt: No such file or directory
> pqinsert ERROR: open: /dev/shm/awcmetars.txt: No such file or directory
> 
> This is the script:
> 
> #!/bin/csh
> printf "\001\r\r\n000 \r\r\n"
> printf "SAUS80 KWBC `date --utc +%d%H%M`\r\r\n"
> printf "METAR\n"
> wget -o /dev/null -O - 
> 'http://adds.aviationweather.gov/metars/index.php?station_ids=@AL%20@AK%20@AZ%20@AR%20@CA%20@CO%20@CT%20@DE%20@FL%20@GA&chk_metars=on'|
>  grep FONT | sed -e 's/<\/FONT>/=/' -e 's/<[^>]*.//g' -e 's/$/\x0D\x0D/'
> printf "\r\r\n\003"
> pqinsert -q /home/ldm/data/ldm.pq -s 000 -f "IDS|DDPLUS" -p "SAUS80 KWBC 
> `date --utc +%d%H%M`" /tmp/awcmetars.txt
> sleep 1
> /bin/rm -f /tmp/awcmetars.txt

It looks like you're relying on the invocation of the script to create the file 
"/tmp/awcmetars.txt" via redirection of the standard output stream --- but the 
script itself also references that same file.  In general, that's not a good 
idea because it couples the invocation of the script with the scripts execution.

I think the rm(1) invocation in the script is removing the output file, 
/tmp/awcmetars.txt, and that the subsequent invocations of pqinsert(1) can't, 
therefore, find the file --- even though it still exists due to output 
redirection of the script invocation.

> #
> printf "\001\r\r\n001 \r\r\n"
> printf "SAUS80 KWBC `date --utc +%d%H%M`\r\r\n"
> printf "METAR\n"
> wget -o /dev/null -O - 
> 'http://adds.aviationweather.gov/metars/index.php?station_ids=@HI%20@ID%20@IL%20@IN%20@IA%20@KS%20@KY%20@LA%20@ME%20@MD&chk_metars=on'|
>  grep FONT | sed -e 's/<\/FONT>/=/' -e 's/<[^>]*.//g' -e 's/$/\x0D\x0D/'
> printf "\r\r\n\003"
> pqinsert -q /home/ldm/data/ldm.pq -s 000 -f "IDS|DDPLUS" -p "SAUS80 KWBC 
> `date --utc +%d%H%M`" /tmp/awcmetars.txt
> sleep 1
> /bin/rm -f /tmp/awcmetars.txt
> #
> printf "\002\r\r\n002 \r\r\n"
> printf "SAUS80 KWBC `date --utc +%d%H%M`\r\r\n"
> printf "METAR\n"
> wget -o /dev/null -O - 
> 'http://adds.aviationweather.gov/metars/index.php?station_ids=@MA%20@MI%20@MN%20@MS%20@MO%20@MT%20@NE%20@NV%20@NH%20@NJ&chk_metars=on'|
>  grep FONT | sed -e 's/<\/FONT>/=/' -e 's/<[^>]*.//g' -e 's/$/\x0D\x0D/'
> printf "\r\r\n\003"
> pqinsert -q /home/ldm/data/ldm.pq -s 000 -f "IDS|DDPLUS" -p "SAUS80 KWBC 
> `date --utc +%d%H%M`" /tmp/awcmetars.txt
> sleep 1
> /bin/rm -f /tmp/awcmetars.txt
> #
> printf "\004\r\r\n004 \r\r\n"
> printf "SAUS80 KWBC `date --utc +%d%H%M`\r\r\n"
> printf "METAR\n"
> wget -o /dev/null -O - 
> 'http://adds.aviationweather.gov/metars/index.php?station_ids=@NM%20@NY%20@NC%20@ND%20@OH%20@OK%20@OR%20@PA%20@RI%20@SC&chk_metars=on'|
>  grep FONT | sed -e 's/<\/FONT>/=/' -e 's/<[^>]*.//g' -e 's/$/\x0D\x0D/'
> printf "\r\r\n\003"
> pqinsert -q /home/ldm/data/ldm.pq -s 000 -f "IDS|DDPLUS" -p "SAUS80 KWBC 
> `date --utc +%d%H%M`" /tmp/awcmetars.txt
> sleep 1
> /bin/rm -f /tmp/awcmetars.txt
> #
> printf "\005\r\r\n005 \r\r\n"
> printf "SAUS80 KWBC `date --utc +%d%H%M`\r\r\n"
> printf "METAR\n"
> wget -o /dev/null -O - 
> 'http://adds.aviationweather.gov/metars/index.php?station_ids=@SD%20@TN%20@TX%20@UT%20@VT%20@VA%20@WA%20@WV%20@WI%20@WY&chk_metars=on'|
>  grep FONT | sed -e 's/<\/FONT>/=/' -e 's/<[^>]*.//g' -e 's/$/\x0D\x0D/'
> printf "\r\r\n\003"
> pqinsert -q /home/ldm/data/ldm.pq -s 000 -f "IDS|DDPLUS" -p "SAUS80 KWBC 
> `date --utc +%d%H%M`" /tmp/awcmetars.txt
> sleep 1
> /bin/rm -f /tmp/awcmetars.txt
> 
> Now, the first part executes just fine; states A-G's METARs get inserted.
> The second one and all the others do grab the METARs, but don't put them
> into the /tmp/awcmetars.txt file.
> 
> I don't know why. I could run 5 different scripts, but why, when I can do
> it all at once. Any idea of what I am doing wrong above?
> 
> Thanks!
> 
> *******************************************************************************
> Gilbert Sebenste                                                     ********
> (My opinions only!)                                                  ******
> Staff Meteorologist, Northern Illinois University                      ****
> E-mail: address@hidden                                  ***
> web: http://weather.admin.niu.edu                                      **
> *******************************************************************************


Regards,
Steve Emmerson

Ticket Details
===================
Ticket ID: LIN-843313
Department: Support LDM
Priority: Normal
Status: Closed