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Kalib Zen
Kalib Zen

Reputation: 925

Combine grep output when piping

I use the following command sipcalc to display information about an IP:

sipcalc 192.16.12.1/16 | grep -E 'Network address|Network mask \(bits\)'

The output is:

Network address     - 192.16.0.0
Network mask (bits) - 16

Is there a way to combine the above output (only the right part), so the output would be:

192.16.0.0/16

I have my own way to do this by separating grep call and then concatenate the result, but I don't think it is a good solution. Can grep or any other commands that can be used to pipe the output like awk in order to obtain the output above?

Upvotes: 0

Views: 169

Answers (1)

Inian
Inian

Reputation: 85895

grep is not really an ideal tool for doing operations beyond just searching for your expected text. Use awk alone!

awk '/Network address/{ ip = $NF } /Network mask \(bits\)/{ print ip "/" $NF}'

Awk processes records in /pattern/ { action } syntax. So when the first pattern in matched, extract the last field delimited by space $NF i.e. a special variable Awk uses to store the value of last column when delimited by space ( See 7.5.1 Built-in Variables That Control awk)

When the second pattern is matched in a similar way, join that last field with the value stored in ip variable. The + just concatenates the individual strings to produce the desired result.

Upvotes: 2

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