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fix: sed line number incorrect #587

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Commits on Aug 22, 2024

  1. fix: sed line number incorrect

    The original code for prefixing line numbers was not working, as
    it was adding less extra space than needed:
    
    ```
    seq 3 | sed = | sed 'N; s/^/   /; s/ *\(.\{6,\}\)\n/\1/'
       1
    1
       2
    2
       3
    3
    ```
    
    Adding few more spaces fixes the issue:
    
    ```
    seq 3 | sed = | sed 'N; s/^/     /; s/ *\(.\{6\}\)\n/\1 /'
         1 1
         2 2
         3 3
    ```
    
    I've also changed `\{6,\}` to `\{6\}`, as the extra `,` shouln't be
    needed and might be confusing.
    iNecas committed Aug 22, 2024
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