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How can I use a variable to find a pattern and then add a text, in the same line, after that pattern?

I tried this but it didn't work:

sed -i "/$node_number/ i mytext" "$filepath.csv";
  • 3
    Hello and welcome to AskUbuntu. Please edit your question to include a minimal example of your input (CSV file) and desired output. – steeldriver Apr 5 '19 at 23:44
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This worked:

sed -i "s/$node_number/&mytext/" "filepath.csv";

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