Select lines and format

Question

Is there a way to format the following output so that only lines 1 and the respective lines that state the "rule" name print out? Depending on the configuation, the "rule" line could vary. It could be the 4th, 5th, 8th line, etc. As shown, the rule name is in brackets. It would be best if the first line and the rule line come out together like show in the "desired output" example below.

command: show virtual server

Original output:

adc virtual name_of_virtual_server {
    output
    destination 10.201.111.101:80
    ip-protocol tcp
    mask 255.255.255.255
    pool test
    profiles {
        test {
            context clientside
        }
        test { }
        test data {
            context serverside
        }
    }
    rules {
        Exchange__all_services2.dat/Exchange__all_services2_rule7
    }
    source 0.0.0.0/0
    source-address-translation {
        pool data_pool
        type snat
    }
    vs-index 13
}

Desired output:

name_of_virtual_server
rules {
     Exchange__all_services2.dat/Exchange__all_services2_rule7

or - even better - with a blank line between entries:

Name: name_of_virtual_server
Rule: Exchange__all_services2.dat/Exchange__all_services2_rule7

Is this possible with sed or awk? Keep in mind there could be hundreds of virtual server configs in one config file if that matters.

Answer 1

Here is one way in perl:

perl -ne 'if (/^adc\s+\w+\s+(\w+)/) { print "Name: $1\n" }
          elsif (/^\s*rules\s*{/) { $inrule = 1; }
          elsif (/}/) { $inrule = 0; }
          elsif (/^\s*(\S*)/) { print "Rule: $1\n" if $inrule; }'

This goes through each line of the file, printing a Name: line when it sees an adc line, and then does a poor attempt at recognizing rules {} blocks, printing each line of those as Rule:.

It would be much more robust to use a proper parser for your input format; this one-liner will break if the layout isn't exactly as in your question.

Answer 2

If there is a proper parser for the file format of that file, you should use it. Lacking that, here is a solution that works for your sample input:

$ awk '/^adc/{print "name:",$3} /^[[:space:]]*rules/{getline;print "rule:",$1}' file
name: name_of_virtual_server
rule: Exchange__all_services2.dat/Exchange__all_services2_rule7

How it works

• /^adc/{print "name:",$3}

  For any line that starts with adc, print out name: and the third item on the line.

• /^[[:space:]]*rules/{getline;print "rule:",$1}

  For any line that starts with spaces (optional) followed by rules, this prints out the first item on the line which follows.