How to match string and print lines within curly braces { } from config file

Question

I want to print the lines within { and } with assign where "mango" in Hostgroups

   object Host "os.google.com" {
    import "windows"
    address = "linux.google.com"
    groups = ["linux"]
    }

    object Host "mango.google.com" {
    import "windows"
    address = "mango.google.com"
    groups = ["linux"]

    assign where "mango" in Hostgroups
    }

Desired output:

    object Host "mango.google.com" {
    import "windows"
    address = "mango.google.com"
    groups = ["linux"]

    assign where "mango" in Hostgroups
    }

You'd probably be better off with something designed to parse Icinga configs, instead of trying to hack together a shell solution that will probably have problems in edge cases with escaped brackets/whitespace/etc. — Joseph Sible-Reinstate Monica, Jun 22 '19 at 17:59
duplicate of the same question. https://stackoverflow.com/questions/56715510/print-a-specific-words-till-matched-string-pattern-2-above-the-matched-string/56715763#56715763 . Edit your former question if there is a change. — Dudi Boy, Jun 22 '19 at 19:36
Possible duplicate of [Print a specific words till matched string ( pattern 2 )above the matched string ( pattern 1 ) in a file](https://stackoverflow.com/questions/56715510/print-a-specific-words-till-matched-string-pattern-2-above-the-matched-string) — Walter A, Jun 22 '19 at 21:48

score 0 · Answer 1 · answered Jun 22 '19 at 20:12

Try this awk script

script.awk

/{/,/}/ { #define record range from { to }
    if ($0 ~ "{") rec = $0; # if record opening reset rec variable with current line
    else rec = rec "\n" $0; # else accumulate the current line in rec
    if ($0 ~ /assign where "mango" in Hostgroups/) { # if found exit pattern in current line
        print rec; # print the rec
        exit;      # terminate
    }
}

executions:

awk -f script.awk input.txt

output:

object Host "mango.google.com" {
import "windows"
address = "mango.google.com"
groups = ["linux"]

assign where "mango" in Hostgroups

score 0 · Answer 2 · answered Jun 22 '19 at 22:07

0

This might work for you (GNU sed):

sed -n '/{/h;//!H;/}/{g;/assign where "mango" in Hostgroups/p}' file

Turn off seds automatic printing using the -n option and gather up lines in the hold space between curly braces. Following the closing curly brace, replace it with the contents of the hold space and if there is a match for assign where "mango" in Hostgroup print it.

answered Jun 22 '19 at 22:07

potong

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The Linux tag was removed (for an unknown reason). You should supply a non-GNU answer. – jww Jun 23 '19 at 01:45
@jww as far as I am aware, this solution will work for the majority of seds out there in the wild. However as I have only tested it using the GNU version I feel it is necessary to provide the qualified message. – potong Jun 23 '19 at 08:19
Solaris results in *`sed: command garbled: /{/h;//!H;/}/{g;/assign where "mango" in Hostgroups/p}`*. OS X results in *`sed: 1: "/{/h;//!H;/}/{g;/assign ...": extra characters at the end of p command`*. – jww Jun 23 '19 at 14:16
@jww I am surprised and saddened that my solution using sed on Solaris and OS X behave as they do but I can only reiterate `might work for you` in my defence. BTW perhaps those OS's prefer each command separately and this can be achieved using the `-e` option and removing the `;`'s or by puting each command on a separate line in a file and using the `-f` option. – potong Jun 23 '19 at 22:01
The above one is working , but its not working when there are {{}} – Haridvpsk Dec 02 '22 at 13:13

score 0 · Answer 3 · answered Jun 23 '19 at 21:57

Assuming } doesn't appear in any other context in your input:

$ awk -v RS='}' '
    /assign where "mango" in Hostgroups/ {
        sub(/^[[:space:]]+\n/,"")
        print $0 RS
    }
' file
    object Host "mango.google.com" {
    import "windows"
    address = "mango.google.com"
    groups = ["linux"]

    assign where "mango" in Hostgroups
    }

How to match string and print lines within curly braces { } from config file

3 Answers3