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How to deliver an error message from script?

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Top Forums Shell Programming and Scripting How to deliver an error message from script?
# 8  
Old 09-23-2014
Hi what is output of below code
Code:
 ftp_log=`/usr/bin/ftp -nv $HOST <<EOF
user $USER $PASSWD
#cd Ordens
binary
mget *HLR*
bye
EOF`
 
echo $ftp_log

# 9  
Old 09-23-2014
The exit status you will get from ftp will always be 0 because the command worked...
# 10  
Old 09-23-2014
Some versions of ftp will return a zero return code if the ftp command itself succeeded, rather that what you are really interested in which is if the action you asked ftp to perform succeeded. I do this by capturing all the output to a log file and then searching for the success flag. The message numbers are three digits. Those 400-999 are errors, so I run a double grep against the log file:-
  • Firstly to find any lines starting with that range of numbers
  • Secondly to ignore any lines that have the string bytes sent or bytes received just in case a file is an awkward number of bytes that is picked up by the first search.
It's roughly built on:-
Code:
grep -E "[4-9][0-9][0-9] " ftp.log | grep -Ev "bytes sent|bytes received"

We do look for more things, so I'm actually using files in both grep commands, but they are specific to our needs.


I hope that this helps.

Robin
# 11  
Old 09-23-2014
Hi

After modifying
Code:
ftp_log=`/usr/bin/ftp -nv $HOST <<EOF`
user $USER $PASSWD
#cd Ordens
binary
mget *HLR*
bye
EOF
echo $ftp_log

I got the following output:

Code:
 ./get_HLR.sh
Connected to 10.100.48.47.
220-FileZilla Server version 0.9.39 beta
220-written by Tim Kosse (Tim.Kosse@gmx.de)
220 Please visit http://sourceforge.net/projects/filezilla/
Remote system type is UNIX.
331 Password required for hlr_dump
230 Logged on
?Invalid command
200 Type set to I
mget HLR01_21092014? 200 Port command successful
150 Opening data channel for file transfer.
226 Transfer OK
local: HLR01_21092014 remote: HLR01_21092014
905052160 bytes received in 34 seconds (26232.79 Kbytes/s)
221 Goodbye
root@moneta #

This time was successfully because, we free up some space on the destination file system
# 12  
Old 09-23-2014
Excellent. Now you have known good output to work with. You can see from your original post that the error is highlighted by this message:-
Code:
426 Connection closed; transfer aborted.

Have a go at trying to manage that and then see if you can replicate it and capture the failure.

Let us know how you get on (with code and output/errors)



Regards,
Robin
# 13  
Old 09-23-2014
Now you can use that log msg to achive your task like below
Code:
ftp_log=`/usr/bin/ftp -nv $HOST <<EOF`
user $USER $PASSWD
#cd Ordens
binary
mget *HLR*
bye
EOF`
if [ `grep "No space left on device" $ftp_log | wc -l` -gt 0 ];
then
    echo "No space left on device" | mailx -s "Error:No Space" youremail@yourcomp.com
else
    echo "File transfered SUCCESSFULLY at $(date)."
fi

# 14  
Old 09-23-2014
You might have to code many many exceptions trying to guess all the possible phrases to worry about this way. It would also mean that you are firing up grep and wc as new processes for every possibility you can think of, and how can you be sure you have thought of them all.

The documentation tells us that the error codes are 400-999, so I would refer you to my earlier suggestion.

If you feel that you don't like this, then I would strongly recommend searching for success messages and report anything else as a failure. Over time, you may hit some false errors, but you can then allow for them. If you miss a failure then that can have more serious consequences.


I've learned by painful experience that having too many false errors is far better than missing a real failure.


Regards,
Robin




As a final note, grep has a -c flag to could records, so saving wc being needed at all, so it will run much faster.
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