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I run nano test.txt

Hello $NAME

then export NAME="World"

  • Then I run envsubst < text.txt it prints Hello World

  • Then I run envsubst < text.txt > new.txt it saves Hello World into new.txt

  • Then I run envsubst < text.txt > text.txt but when open text.txt but it is an empty file

How can I replace the file with envsubst?

Cyrus
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Amin Ba
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  • `envsubst < text.txt | sponge text.txt`? See `man sponge`. You may need to install `sponge` first. – Cyrus May 09 '22 at 20:41
  • This question is unrelated to `envsubst`, but a general problem with redirection. You would observe the same effect with, i.e., `tr` or `sed`. – user1934428 May 10 '22 at 06:53

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