Question 211221 in Ubuntu Question posted in
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Ubuntu – How to modify a file with sed?

I need to modify a file in a Docker image. I would like to change the line 2357 of a Python module mod.py with sed, how can I do that ?

        raise ExchangeError(self.id + ' ' + errorText + '(#' + errorCode + ')')

The desired output would be:

        raise ExchangeError(self.id + '(#' + errorCode + ')')

or

        raise ExchangeError(self.id)
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3

Answers


  1. 0

    You can use the following sed command to replace content on a specific line:

    sed '2357s/AAA/BBB/'

    Where:

    • 2357 is the target line number
    • s stands for "substitute", meaning replace a string
    • AAA is your original string, in your usecase:

    raise ExchangeError(self.id + ‘ ‘ + errorText + ‘(#’ + errorCode +
    ‘)’)

    • BBB is the desired replacement string

    You might have to play around with escaping special characters.

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  2. 0

    If the line you want to edit is unique in the code, try the following.

    sed -i 's|raise ExchangeError(self.id + ' ' + errorText + '(#' + errorCode + ')') .*|raise ExchangeError(self.id + '(#' + errorCode + ')')|' mod.py

    It would search for the exact line and replace it.

    The cleaner syntax is as follows:

    sed -i 's|text_to_match .*|text_to_replace_with|' filename
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  3. 0

    Try it with:

    sed -i "2357s/+ ' ' + errorText //" path/mod.py
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