To have a numeric result from grep

Hak Dee · #1 (**permalink**) 08-07-2006

I am new to unix. i need to know how to use grep to grep and expression from a file. and pass the result as a 0 for found and 1 for not found. I can only go up to grep 'Checking Subscription Status' ranos.log. Please help. Thank you.

Dhruva · #2 (**permalink**) 08-07-2006

let's take it with example
suppose there is a file "sample.txt" with contents
1c1 Berger Awc ANP20070201301 4000.50
1c2 Bose W G ANP20070201609 6000.70
1c2 Andy CK ANP20070201230 28000.00
1c3 Bharg ANP20070201847 9000.80

and you want to search for a string "Berger".The following command will give value 0 in X if patern found else 1.

Code:

grep -i "berger" sample.txt>/dev/null
X=`echo $?`

blowtorch · #3 (**permalink**) 08-07-2006

You don't have to worry about converting the result into 0 for found and 1 otherwise. The shell takes care of this for you.
Check the status like this:

Code:

grep 'Checking Subscription Status' ranos.log > /dev/null
if [ $? -eq 0 ]; then
   echo success!
else
   echo failure!!
fi

All commands have a return code that is returned to the sh/ksh/bash family of shells as the variable $? (grep will return 0 if it finds what it is looking for). You can just run the return code via an if, and get your result.

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