Insert/Add String to Beginning of a File

Inserting a String to Beginning of File

  1. Suppose you had a text file with the contents and you wanted to insert a string to the beginning:
    1st line
    2nd line
    3rd line
  2. Run the command:
    sed -i '1s/^/<add text > \n/' file.txt
  3. Now the file will look like this:
    Top of the file!
    1st line
    2nd line
    3rd line

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