Grep – How to Find Closing Bracket

awkgrepsedtext processing

One part of /usr/share/X11/xkb/symbols/us starts with xkb_symbols "dvorak" { and ends with the closing curly bracket }; which line-number I want to find. 

partial alphanumeric_keys
xkb_symbols "dvorak" {

    name[Group1]= "English (Dvorak)";

    key <TLDE> { [       grave, asciitilde, dead_grave, dead_tilde      ] };

    key <AE01> { [          1,  exclam          ]       };
    key <AE02> { [          2,  at              ]       };
    key <AE03> { [          3,  numbersign      ]       };
    key <AE04> { [          4,  dollar          ]       };
    key <AE05> { [          5,  percent         ]       };
    key <AE06> { [          6,  asciicircum, dead_circumflex, dead_circumflex ] };
    key <AE07> { [          7,  ampersand       ]       };
    key <AE08> { [          8,  asterisk        ]       };
    key <AE09> { [          9,  parenleft,  dead_grave] };
    key <AE10> { [          0,  parenright      ]       };
    key <AE11> { [ bracketleft, braceleft       ]       };
    key <AE12> { [ bracketright, braceright,  dead_tilde] };

    key <AD01> { [  apostrophe, quotedbl, dead_acute, dead_diaeresis    ] };
    key <AD02> { [      comma,  less,   dead_cedilla, dead_caron        ] };
    key <AD03> { [      period, greater, dead_abovedot, periodcentered  ] };
    key <AD04> { [          p,  P               ]       };
    key <AD05> { [          y,  Y               ]       };
    key <AD06> { [          f,  F               ]       };
    key <AD07> { [          g,  G               ]       };
    key <AD08> { [          c,  C               ]       };
    key <AD09> { [          r,  R               ]       };
    key <AD10> { [          l,  L               ]       };
    key <AD11> { [      slash,  question        ]       };
    key <AD12> { [      equal,  plus            ]       };

    key <AC01> { [          a,  A, adiaeresis, Adiaeresis ]     };
    key <AC02> { [          o,  O               ]       };
    key <AC03> { [          e,  E               ]       };
    key <AC04> { [          u,  U               ]       };
    key <AC05> { [          i,  I               ]       };
    key <AC06> { [          d,  D               ]       };
    key <AC07> { [          h,  H               ]       };
    key <AC08> { [          t,  T               ]       };
    key <AC09> { [          n,  N               ]       };
    key <AC10> { [          s,  S               ]       };
    key <AC11> { [      minus,  underscore      ]       };

    key <AB01> { [   semicolon, colon, dead_ogonek, dead_doubleacute ] };
    key <AB02> { [          q,  Q               ]       };
    key <AB03> { [          j,  J               ]       };
    key <AB04> { [          k,  K               ]       };
    key <AB05> { [          x,  X               ]       };
    key <AB06> { [          b,  B               ]       };
    key <AB07> { [          m,  M               ]       };
    key <AB08> { [          w,  W               ]       };
    key <AB09> { [          v,  V               ]       };
    key <AB10> { [          z,  Z               ]       };

    key <BKSL> { [  backslash,  bar             ]       };
};

I can find the start of the environment which returns 192

grep -n 'xkb_symbols "dvorak"' /usr/share/X11/xkb/symbols/us | cut -d ":" -f1 > /tmp/lineNumberStartEnvironment

I do but blank output

# http://unix.stackexchange.com/a/147664/16920
grep -zPo 'pin\(ABC\) (\{([^{}]++|(?1))*\})' /usr/share/X11/xkb/symbols/us

Pseudocode

  1. Go first to the linenumber given by file /tmp/lineNumberStartEnvironment.
  2. Find the closing bracket of the thing located at the line of /tmp/lineNumberStartEnvironment.
    • do this with the data content in the body but also with the complete file /usr/share/X11/xkb/symbols/us

Attempt for heredoc until next line [cas, Kusalananda]

I do where I do not know what I should put to the deliminator; -n returns blank too

sed -n -f - /usr/share/X11/xkb/symbols/us <<END_SED | cut -f1
/xkb_symbols "dvorak" {/,/^};/{
        /xkb_symbols "dvorak" {/=
        /^};/=
}
END_SED

but blank output.

Systems: Ubuntu 16.04
Grep: 2.25

Best Answer

This sed script prints the line number of the line matching /^};/ in the range of lines from /xkb_symbols "dvorak" {/ to the next /^};/ (which will be the same }; as the one we get the line number for):

/xkb_symbols "dvorak" {/,/^};/{
        /^};/=
}

If you need both start and end line numbers:

/xkb_symbols "dvorak" {/,/^};/{
        /xkb_symbols "dvorak" {/=
        /^};/=
}

$ sed -n -f tiny_script.sed /usr/share/X11/xkb/symbols/us
192
248

Alternatively:

$ sed -n -f - /usr/share/X11/xkb/symbols/us <<END_SED
/xkb_symbols "dvorak" {/,/^};/{
        /xkb_symbols "dvorak" {/=
        /^};/=
}
END_SED

EDIT: To get these two numbers in a variable, assuming you're using Bash:

pos=( $( sed -n -f - /usr/share/X11/xkb/symbols/us <<END_SED
        /xkb_symbols "dvorak" {/,/^};/{
                /xkb_symbols "dvorak" {/=
                /^};/=
        }
END_SED
) )

echo "start = " ${pos[0]}
echo "end   = " ${pos[1]}

Also, hi! Another Dvorak user!

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