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wb9688
Asked: 2015-06-13 06:58:14 +0800 CST

How do I remove comments of a file?

  • 772

I have an file (hosts.txt) and many lines in that file are comments. How do I remove that comments?

text-processing

5 Answers

  1. Best Answer
    sed '/^\#/d' myFile > tt
mv tt myFile

    What happens here:

    sed '/^#/d' myFile removes all lines starting with # from the file myFile and outputs the result in the console, > tt redirects the output into a temporary file called tt, mv tt myFile moves the temporary file tt to myFile.

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  2. You can use the sed Command and redirect the result to a new file by typing:

    sed '/^\#/d' hosts.txt > cleaned.txt
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  3. You can use -i to edit files in place.

    sed -i '/^#/d' hosts.txt

    Or with a backup

    sed -ibak '/^#/d' hosts.txt

    from man sed

    -i[SUFFIX], --in-place[=SUFFIX]
      edit files in place (makes backup if SUFFIX supplied)
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  4. you can use this:

    sed '/^#/ d' < inputFile.txt > outputFile.txt
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  5. You can use Vim in Ex mode:

    ex -sc g/^#/d -cx hosts.txt

    1. g global search

    2. d delete

    3. x save and close

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