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Full Discussion: Problem assigning cmd output to variable then using in IF statement
Top Forums Shell Programming and Scripting Problem assigning cmd output to variable then using in IF statement Post 302555324 by dqrgk0 on Wednesday 14th of September 2011 12:01:52 PM
Old 09-14-2011
Problem assigning cmd output to variable then using in IF statement
Hi,

I'm using the bourn shell on a Sun Solaris Unix system. I am relatively new to UNIX scripting so please bear with me...

I'm having a couple issues:

1) I need to have a variable $FSIZE set with the output of a command each time the script runs. (the command looks for a file and gets its fize size in bytes).

2) I need to have the appended output text from du -b stripped off before assigning the file size to the $FSIZE variable in order to for #3 to work.

3) Then I need to use the $FSIZE in my first IF clause's expression to be part of the evaluation. If the file size is > 220 bytes then send an email and stop execution of the script at that point.

I am wrapping my code with the code tags so I hope it worked...If I was unclear about anything, please let me know. Thank you for the help.

Here is my code:
Code:
 
#!/bin/sh -x
#
EXISTINGFILE="/test/inbound/finaltickets.csv"
du -b $EXISTINGFILE | read size1
FSIZE=$size1
echo $FSIZE
if [ $FSIZE -lt 220 ]
then
echo "Error: The existing file is less than 220 bytes.  This indicates a possible corrupt file." | mailx -s "Existing file less than 220 bytes error" fname.lname@email.com
exit 0
#If this condition is true, then exist the script entirely after the email has been sent.
fi

if [[ -s $EXISTINGFILE ]];
then
head -1 $EXISTINGFILE | grep '^Ticket Number Number,Ack_Line Number,Ack_NSN,Ack_Fedstrip' >/dev/null 2>&1
if (( $? == 0 ));
then
#Yes-Header pattern was found and file was greater than 0 bytes.
echo "Warning: Process found an existing inbound file containing records." | mailx -s "Process Issue (File Already Exists) - Please Investigate" fname.lname@email.com
cat /test/inbound/newtickets.*.csv >> /test/inbound/finaltickets.csv
mv /test/inbound/newtickets.*.csv /test/inbound/archive/

else
#No-Header pattern was not found and file was greater than 0 bytes.
cat /test/inbound/newtickets.*.csv >> /test/inbound/finaltickets.csv
sed -e '1i\Ticket Number Number,Ack_Line Number,Ack_NSN,Ack_Fedstrip' /test/inbound/finaltickets.csv > /test/inbound/finaltickets.csv.tmp
mv /test/inbound/finaltickets.csv.tmp /test/inbound/finaltickets.csv
mv /test/inbound/newtickets.*.csv /test/inbound/archive/
exit 1
fi

else
#No-Header pattern was not found and filter is 0 bytes.
cat /test/inbound/newtickets.*.csv >> /test/inbound/finaltickets.csv
sed -e '1i\Ticket Number Number,Ack_Line Number,Ack_NSN,Ack_Fedstrip' /test/inbound/finaltickets.csv > /test/inbound/finaltickets.csv.tmp
chmod 775 /test/inbound/finaltickets.csv.tmp
mv /test/inbound/finaltickets.csv.tmp /test/inbound/finaltickets.csv
mv /test/inbound/newtickets.*.csv /test/inbound/archive/
exit 2
fi
exit 0

I will post a reply with the results I am getting trying to run this script shortly after this one.

Thanks,
D

---------- Post updated at 11:01 AM ---------- Previous update was at 10:58 AM ----------

As mentioned, here is the results I get attempting to run the script:

Code:
 
+ EXISTINGFILE=/test/inbound/finaltickets.csv
+ du -b /test/inbound/finaltickets.csv
+ read size1
+ FSIZE=
+ echo
+ '[' -lt 220 ']'
/test/inbound/./test_wip.sh: line 9: [: -lt: unary operator expected
+ [[ -s /test/inbound/finaltickets.csv ]]
+ head -1 /test/inbound/finaltickets.csv
+ grep '^Ticket Number,Ack_Line Number,Ack_NSN,Ack_Fedstrip'
+ ((  0 == 0  ))
+ echo 'Warning: Process found an existing inbound file containing records.'
+ mailx -s 'Process Issue (File Already Exists) - Please Investigate' fname.lname@email.com
+ cat /test/inbound/newtickets.20110825.073015.csv
+ mv /test/inbound/newtickets.20110825.073015.csv /test/inbound/archive/
+ exit 0

Please note that if my script did not have the following code in it, it executes successfully. So I am obviously not incorporating the "fize size" piece of the code in correctly...

Code:
 
du -b $EXISTINGFILE | read size1
FSIZE=$size1
echo $FSIZE
if [ $FSIZE -lt 220 ]
then
echo "Error: The existing file is less than 220 bytes.  This indicates a possible corrupt file." | mailx -s "Existing file less than 220 bytes error" fname.lname@email.com
exit 0
#If this condition is true, then exist the script entirely after the email has been sent.
fi

Thanks UNIX gurus,
D
 

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