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grep a line from a text file

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# 1  
Old 09-14-2010
grep a line from a text file
Hi all,

I need to grep a line from a log file which ensures me that the application server script is executed successfully. Some body please help me on this.

I also need to write a while loop in which i need to use the status of the above grep output. Could some one please tell me how to use that.

Thanks in advance.
Firestarr
# 2  
Old 09-14-2010
Code:
grep -q "search_str" log_file

Gives the status of the command
# 3  
Old 09-14-2010
Can i use
Code:
var=`grep -q "search_str" log_file`
echo $var

but its returning nthg...
Last edited by Yogesh Sawant; 09-15-2010 at 09:16 AM.. Reason: added code tags
# 4  
Old 09-14-2010
Code:
grep -q "search_str" log_file
var=$?
echo $var

# 5  
Old 09-15-2010
@anbu23

thank you for the reply

---------- Post updated at 10:30 AM ---------- Previous update was at 10:21 AM ----------

Can i use this way...
Code:
grep -q "search_str" log_file
while [ $? ]
do 
echo wroking
done

will this work??
Last edited by Scott; 09-15-2010 at 05:51 PM.. Reason: Code tags please...
# 6  
Old 09-15-2010
If the grep command finds the string, the exit status of command is successful. Then While loop is entered. For the next run of while loop $? comes from the last command you placed in the while loop.

If you can explain your requirement we can help you in better way.
# 7  
Old 09-15-2010
Code:
grep -i "search_string" log_filename
status=$?
if [ $status -eq 0 ]
then
  echo "grep successful"
 else
  echo "unsucessful"
fi
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