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cli-sedHow can I use a variable with the sed command line tool?

The sed command line tool can be used to perform text manipulation on a file or stream. To use a variable with the sed command line tool, you can use the -e (--expression) option. The -e option allows you to pass an expression to sed, which can include a variable. For example:

sed -e "s/world/$my_var/" test.txt

The example above replaces the word "world" with the contents of the variable my_var in the file test.txt.

The parts of the code are as follows:

  • my_var="hello" - this sets the variable my_var to the value hello
  • sed -e "s/world/$my_var/" test.txt - this runs the sed command, using the expression s/world/$my_var/ on the file test.txt

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