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Asked: 2026-05-11T00:44:43+00:00

I have a skeleton text file with placeholder strings: blah blah blah blah $PLACEHOLDER_1$

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I have a skeleton text file with placeholder strings:

blah blah blah blah $PLACEHOLDER_1$ blah $PLACEHOLDER_2$

and so on. Specific ‘form’ of placeholders does not matter — I may change them to whatever most comfortable for specific implementation.

I have a bash script where I know values for placeholders, and I need to generate a new file, with placeholders replaced with values.

#! /bin/sh PLACEHOLDER_1 = 'string 1' PLACEHOLDER_2 = 'multiline  string  2' # TODO: Generate file output.txt from file output.template  #       using placeholders above.

I may do this in multiple passes with sed, but it is not fun. I do not want to use Perl. I want to use textutils and bash itself only.

What is the best way to do what I want in a single pass?

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1 Answer

  1. You can still use sed to do the replace in a single pass. You just need to specify all the replacements in one command.

    eg.

    sed -i 's/PLACEHOLDER_1/string 1/g;s/PLACEHOLDER_2/string 2/g' <file>
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