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Search file pattern using grep command

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# 1  
Old 03-01-2016
Search file pattern using grep command
I 'm writing a script to search particular strings from log files. The log file contains lines start with *. The file may contain many other lines start with *. I need to search a particular line from my log file. The grep command is working in command line , but when i run my script, Its printing all files in that directory . ( Example : script1.shScript2.shMessage CompletedScript4.sh)

Any suggestions?


Ex:

**********************Message Completed**********
Code:
tail -F file.log  | while read LINE
do
   echo $LINE | awk '{print $0}' | grep "[\*]*.Message Completed*" >>$TestFile
done



Thanks for your help !
Last edited by zaxxon; 03-01-2016 at 11:50 AM.. Reason: code tags, not icode
# 2  
Old 03-01-2016
Not clear. What exactly is the problem? What's the difference between your command and your script?
# 3  
Old 03-01-2016
The code is not working inside the script.
If i try
Code:
grep "[\*]*.Message Completed*"  $Logfile

in the command line its printing the correct line. But if i try the below line inside the script its not working.

Code:
echo $LINE | awk '{print $0}' | grep "[\*]*.Message Completed*"


Let me know if u need any other information.
Last edited by Scrutinizer; 03-01-2016 at 03:25 PM.. Reason: CODE tags
# 4  
Old 03-01-2016
or maybe:
Code:
tail -F file.log | awk '/[*].*Message Completed/' > $TestFile

sure about the -F option?
# 5  
Old 03-01-2016
You need to use double quotes around the expansion of variable LINE. Try:
Code:
tail -F file.log  | while read LINE
do
   echo "$LINE" | awk '{print $0}' | grep "[\*]*.Message Completed*" >>$TestFile
done

or try shell-only without grep and awk:

Code:
tail -F file.log  |
while read LINE
do
  case $LINE in 
    (*"*Message Completed"*) printf "%s\n" "$LINE"
  esac
done >>$TestFile


--
Note that the shell approach has an advantage that it is faster and does not use buffering, which works better in combination with tail -F
Last edited by Scrutinizer; 03-01-2016 at 10:43 PM..
This User Gave Thanks to Scrutinizer For This Post:
vinus
# 6  
Old 03-01-2016
Scrutinizer,

Thanks a lot for your help !

I tried the below line and it worked .
Code:
echo "$LINE" | awk '{print $0}' | grep "[\*]*.Message Completed*" >>$TestFile

I spent many hours and couldn't find the solution. Thank you so much !
Last edited by Scrutinizer; 03-01-2016 at 10:38 PM.. Reason: ICODE tags -> CODE tags
# 7  
Old 03-01-2016
The
Code:
 | awk '{print $0}'

has no effect. You can omit it.
This User Gave Thanks to MadeInGermany For This Post:
vinus
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