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script not working after "tail -f"

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Top Forums Shell Programming and Scripting script not working after "tail -f"
# 8  
Old 07-02-2007
Lightbulb Little more help after this
Hi

Thank you very much !!!!!!!!!!!!

Your code is working fine
Code:
#!/bin/bash
tail -f abc.log | 
while read -r line
do
   [[ "$line" != *exceptions* ]] && continue
   echo $line
   echo hi
done

Now i want to further refine the output

as there are differrent kind of exception are received
with this code for example :
Quote:
output of your script gives
exception.InterfaceException: Error MNP duplicate found
hi
exception.InterfaceException: Error MNP duplicate found
hi
exception.InterfaceException: Error MNP duplicate found
hi
exception.InterfaceException: Error MNP duplicate found
hi
exception.CardPaymentException: Payment gateway rejected transaction
hi
exception.CardPaymentException: Payment gateway rejected transaction
hi
exception.CardPaymentException: Payment gateway rejected transaction
hi
exception.CardPaymentException: Failed to retrieve digital receipt from database
hi
exception.TaxStrategyException: Error during port.getTax(getTaxRequest)) Error
hi

Quote:
and if i want the out put to be such that only the following lines are furter filtered out of the above exceptions :-----

exception.CardPaymentException: Failed to retrieve digital receipt from database
hi
exception.TaxStrategyException: Error during port.getTax(getTaxRequest)) Error
hi

# 9  
Old 07-02-2007
Code:
[[ "$line" != *CardPaymentException* && "$line" != *TaxStrategyException* ]] && continue

# 10  
Old 07-02-2007
Aigles,

Can you please elaborate on

read -r option? Just read the definition and cannot understand why -r was used. thank you for your great work as always~



-r Backslash does not act as an escape character.
The backslash is considered to be part of the line. In
particular, a backslash-newline pair may not be used as a line
continuation.
Code:
#!/bin/bash
tail -f abc.log | 
while read -r line
do
   [[ "$line" != *exceptions* ]] && continue
   echo $line
   echo hi
done

# 11  
Old 07-02-2007
Lightbulb How to get negated output
Hi
First thanks to all the genious minds who share their knowledge on this platform .
Smilie
Now Further i would like to ask that in this code to filter out the exceptions
Quote:
output of script gives
exception.InterfaceException: Error MNP duplicate found
hi
exception.InterfaceException: Error MNP duplicate found
hi
exception.InterfaceException: Error MNP duplicate found
hi
exception.InterfaceException: Error MNP duplicate found
hi
exception.CardPaymentException: Payment gateway rejected transaction
hi
exception.CardPaymentException: Payment gateway rejected transaction
hi
exception.CardPaymentException: Payment gateway rejected transaction
hi
exception.CardPaymentException: Failed to retrieve digital receipt from database
hi
exception.TaxStrategyException: Error during port.getTax(getTaxRequest)) Error
hi
How can we negate the output i.e the code
Quote:
#!/bin/bash
tail -f abc.log |
while read -r line
do
[[ "$line" != *exceptions* ]] && continue
echo $line
echo hi
done
should give the output other than the above mentioned i.e after filtering out the above exceptions . it should display all the other kind of exceptions coming . for example output should be :
Quote:
exception.DatabaseException: Database error occured
hi
exception.DatabaseException: Database error occured -311
hi
exception.InterfaceException:Anu no found
hi
exception.InterfaceException: Error checking linked numbers, negative ani position
hi
exception.CardPaymentException: Error checking linked numbers, negative ani position
hi
exception.DatabaseException: Database error occured -311
hi
exception.DatabaseException: Database error occured
hi
exception.DatabaseException: Error checking linked numbers, negative ani position
hi
exception.TaxStrategyException: calculate tax failed
hi
Thanks Smilie
Last edited by xander; 07-03-2007 at 10:42 AM..
# 12  
Old 07-03-2007
Pleasde help if some suggestion is there
hi
Please help me if some valuable suggestion is there

Thanx in Advance
# 13  
Old 07-03-2007
I am not sure to understand what you want to do.
If you want to display exceptions only once, you can try something like that :
Code:
exc_file=exceptions.$$
trap "rm -f $exc_file" EXIT

touch $exc_file

tail -f abc.log |
while IFS= read -r line
do
   [[ "$line" != *exception* ]] && continue
   if ! grep -q "^$line\$" $exc_file
   then
      echo "$line" >> $exc_file
      echo "$line"
      echo "hi"
   fi
done
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