If a line starts with condition, insert variable after 187th character

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I have a .txt file with >10k lines. Some of the lines start with 1,POS,MGC=or 1,NEG,MGC=. For these lines, I want to insert a variable after the 187th character on the line while preserving the text after.



So far what I have is



awk 'BEGINFS=OFS=""
if (substr($0,1,10)~"1,...,MGC=")
$187=$variable inputfile > outputfile


which doesn't really work at all.






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    I have a .txt file with >10k lines. Some of the lines start with 1,POS,MGC=or 1,NEG,MGC=. For these lines, I want to insert a variable after the 187th character on the line while preserving the text after.



    So far what I have is



    awk 'BEGINFS=OFS=""
    if (substr($0,1,10)~"1,...,MGC=")
    $187=$variable inputfile > outputfile


    which doesn't really work at all.






    text-processing






    share







    New contributor




    erik is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.





















      up vote
      1
      down vote

      favorite









      up vote
      1
      down vote

      favorite











      I have a .txt file with >10k lines. Some of the lines start with 1,POS,MGC=or 1,NEG,MGC=. For these lines, I want to insert a variable after the 187th character on the line while preserving the text after.



      So far what I have is



      awk 'BEGINFS=OFS=""
      if (substr($0,1,10)~"1,...,MGC=")
      $187=$variable inputfile > outputfile


      which doesn't really work at all.






      text-processing






      share







      New contributor




      erik is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      I have a .txt file with >10k lines. Some of the lines start with 1,POS,MGC=or 1,NEG,MGC=. For these lines, I want to insert a variable after the 187th character on the line while preserving the text after.



      So far what I have is



      awk 'BEGINFS=OFS=""
      if (substr($0,1,10)~"1,...,MGC=")
      $187=$variable inputfile > outputfile


      which doesn't really work at all.






      text-processing




      text-processing





      share







      New contributor




      erik is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.










      share







      New contributor




      erik is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.








      share



      share






      New contributor




      erik is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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      asked 7 mins ago









      erik

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      erik is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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