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emmdee
Asked: 2020-04-09 15:53:21 +0800 CST

Have sed -i output to stdout the way just sed does

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When I am running sed operations on a file, for example:

sed 's/this/that/' /my/file.txt

The output is displayed on stdout.

However, when I apply the changes in place with -i there is no stdout (no output at all to screen).

sed -i 's/this/that/' /my/file.txt

How can I still output to screen when I'm using the -i trigger?

linux sed

1 Answers

  1. You can't. You've probably already noticed that if you 

    sed -i 's/this/that/p' /my/file.txt

    it just includes that line twice in /my/file.txt.

    You can, of course, cheat:

    sed -i 's/this/that/' /my/file.txt; cat /my/file.txt

    or, if appropriate

    sed -i 's/this/that/' /my/file.txt && cat /my.file.txt
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