How to check line existence in shell ?

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06-16-2014

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How to check line existence in shell ?

Hi,

We have some config file and there we are looking to append a line if it is not found.

Code:

abc.conf
authpriv.*                                              /var/log/secure
mail.*                                                  -/var/log/maillog
*.debug  @vxhgt-hskhng02
cron.*                                                  /var/log/cron

Till now I have tried as below but no luck. Every time the line is appending to the file, even if the line is already present.
Note : there could be space or multiple tab between *.debug and @vxhgt-hskhng02. To handle the same I have used [:blank:] in my code.

Code:

PATTERN="*.debug[:blank:]@vxhgt-hskhng02" FILE=/etc/abc.conf if grep -q $PATTERN $FILE; then
echo "given pattern already found."

else
echo "pattern not found."
echo "*.debug  @vxhgt-hskhng02" >> /etc/abc.conf
fi

kindly suggest where I am going wrong here.

---------- Post updated at 04:09 PM ---------- Previous update was at 03:35 PM ----------

After searching in google....I got something like below

Code:

if grep -Fxq $PATTERN $FILE; 
then
echo "found"
else
echo "notfound"
fi

Still no luck.

Regards,
Litu

Last edited by Scrutinizer; 06-16-2014 at 09:14 AM.. Reason: additional code tags

Litu19

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06-16-2014

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Try:

Code:

PATTERN= "\*\.debug[[:space:]]*\@vxhgt-hskhng02[[:space:]]*"

chacko193

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06-16-2014

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Thanks for quick reply.
I tried your way...but no luck. It is still appending the entry even if it already present there.

Litu19

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06-16-2014

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small modification to PATTERN makes it work:

Code:

PATTERN="*.debug[[:blank:]]*@vxhgt-hskhng02"
grep  $PATTERN file
*.debug  @vxhgt-hskhng02

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06-16-2014

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Quote:

Originally Posted by chacko193

Try:

Code:

PATTERN= "\*\.debug[[:space:]]*\@vxhgt-hskhng02[[:space:]]*"

There is a typo in my last post. There should have been no space in the assignment operation.

Code:

# cat testIn
abc.conf
authpriv.*                                              /var/log/secure
mail.*                                                  -/var/log/maillog
*.debug  @vxhgt-hskhng02
cron.*                                                  /var/log/cron
# PATTERN="\*\.debug[[:space:]]*\@vxhgt-hskhng02[[:space:]]*"
# if grep -q $PATTERN testIn
> then
> echo "Pattern found"
> else
> echo "Pattern Not found"
> fi
Pattern found

Last edited by chacko193; 06-16-2014 at 09:26 AM.. Reason: typo

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06-16-2014

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Try:

Code:

awk -v s='*.debug  @vxhgt-hskhng03' 'BEGIN{split(s,F)} 1; {for(i in F) if($i!=F[i]) next; f=1} END{if(!f) print s}' file

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06-17-2014

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Thanks for your help. It worked out for me.

---------- Post updated 06-17-14 at 11:38 AM ---------- Previous update was 06-16-14 at 07:51 PM ----------

I found one disconnect in my logic while appending the entry to the file.

If file conatins an entry for *debug @vxhgt-hskhng02 but it is commented, then we must append the entry to the file.

Code:

abc.conf

# *debug @vxhgt-hskhng02

In the above case we must append the entry.
Please suggest.

Litu19

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