Extracting specific data from SNMP

Solution 1

grep has that option built-in, I use it myself sometimes.
From man grep:

 -o, --only-matching Print only the matched (non-empty) parts of a matching line, with each such part on a separate output line. 

Then you could use tr to get rid of unwanted characters:

$ tr -d '"' 

Test string:

$ echo 'SMI::enterprises.9.9.543.1.2.3.1.3.1.1.2 = STRING: "securityk9"' | grep -E -o '"(.*?)"' | tr -d '"' 

Output:

securityk9 

Solution 2

Another way, if number of space-delimited fields is consistent, could be using cut (and tr, so still 2 pipes and I'm sure it can be done in one run):

$ cut -d ' ' -f 4 | tr -d '"' 

Test:

$ echo 'SMI::enterprises.9.9.543.1.2.3.1.3.1.1.2 = STRING: "securityk9"' | cut -d ' ' -f 4 | tr -d '"' securityk9 

Solution 3

Using perl should be most universal and portable among all Linux and Unix systems having Perl 5 installed. Pipe your output to:

perl -p -e 's/.*?"(\w+)"/$1/g' - 

Example:

$ echo 'SNMPv2-SMI::enterprises.9.9.543.1.2.3.1.3.1.1.1 = STRING: "ipbasek9"' | perl -p -e 's/.*?"(\w+)"/$1/g' - ipbasek9 

Explanation:

-p iterate over each line of input -e execute following code s/foo/bar/g substitute 'foo' with 'bar' globally, in entire line .*?" match any characters non-greedy, so up to first left-most double quote " (\w+) match and capture into $1 any word-characters (alphanumeric, underscore _, plus connector punctuation chars) $1 substitute with with whatever was captured in first parenthesis