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Shell Programming and Scripting

How to check line existence in shell ?

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Top Forums Shell Programming and Scripting How to check line existence in shell ?
# 8  
Old 06-17-2014
Try:
Code:
PATTERN='*.debug @vxhgt-hskhng02'
awk -v p="$PATTERN" 'BEGIN{split(p,F)} 1; {for(i in F) if($i!=F[i] || $i~/^#/) next; f=1} END{if(!f) print p}' file


---
On Solaris use /usr/xpg4/bin/awk rather than awk
Last edited by Scrutinizer; 06-17-2014 at 03:31 AM..
# 9  
Old 06-17-2014
Hi Scrutinizer,

I appreciate your quick response.

As of now I have used grep command as mentioned below and it is working fine.

Code:
myfile
uucp,news.crit                                          /var/log/spooler
local7.*                                                /var/log/boot.log
*.debug         @vxhgt-hskhng02

Code:
#!/bin/bash
PATTERN="\*\.debug[[:blank:]]*\@vxhgt-hskhng02"
myfile=/etc/testfile
if grep -q $PATTERN $myfile
then
echo "pattern found"
else
echo "not found"
fi


In the same code I just want to add a logic to append the entry to the file, if the entry is present but it is commented.

We dont want to change the whole script again and use awk command. I hope you can understand mine point of view. Would you mind to suggest a solution that use grep command.

Regards,
Litu
# 10  
Old 06-17-2014
I understand. How about:
Code:
PATTERN="^[[:blank:]]*\*\.debug[[:blank:]]*@vxhgt-hskhng02"

Last edited by Scrutinizer; 06-17-2014 at 06:22 AM..
This User Gave Thanks to Scrutinizer For This Post:
Litu19
# 11  
Old 06-17-2014
While testing I found it is working. I have one doubt here ...how ^[[:blank:]]* is able read whether the line begins with # or not.

Code:
PATTERN="^[[:blank:]]*\*\.debug[[:blank:]]*\@vxhgt-hskhng02"

Can u just explain the command here.

Thanks,
Litu
Last edited by Scrutinizer; 06-17-2014 at 06:14 AM.. Reason: code tags
# 12  
Old 06-17-2014
It matches the pattern if preceded by only space ([[:blank:]]*) and only if that is at the beginning of the line (^). So if there is a comment character there, then there will be no match...

The old pattern that you were using wasn't right anyway, because if would have also matched something like tst*.debug @vxhgt-hskhng02 which is not right. Using ^[[:blank:]]* at the beginning fixes that as well (with the awk suggestion this precaution is not necessary since it uses string matching and discards leading space)..

Note that I removed the backslash before the @ since that is not necessary..
# 13  
Old 06-17-2014
Thanks for your nice explanation and the way you handle and fix one more bug in my old logic. Appreciate your timely and quick response. I will have couple of tests again in our prod and will update thread.
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