Home/ Questions/Q 8274255
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-06-08T07:41:00+00:00

can I use sed or awk to append to the previous line if a

  • 0

can I use sed or awk to append to the previous line if a match is found ?

I have a file which has the format :

          INT32
          FSHL (const TP  Buffer)
             {
          INT32
          FSHL_lm (const TP  Buffer) 
          { WORD32 ugo = 0; ...

What I am trying to do is scan for independant open braces {and append it to the previous non-blank line .The match should not occur for an open brace appended by anything in the same line .

The expected output :

           INT32
          FSHL (const TP  Buffer){
          INT32
          FSHL_lm (const TP  Buffer) 
          { WORD32 ugo = 0; ...

Thanks for the replies .

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    This might work for you (GNU sed):

    sed '$!N;s/\n\s*{\s*$/{/;P;D' file

    Explanation:

    • $!N unless the last line append the next line to the pattern space.
    • s/\n\s*{\s*$/{/ replace a linefeed followed by no or any amount of white space followed by an opening curly brace followed by no or any amount of white space to the end of the string, by an opening curly brace.
    • P print upto and including the first newline.
    • D delete upto and including the first newline (if so do not start a new cycle).
    • 0