Expanding environment variables with sed

[tobyt...@gmail.com]

I am trying to write a sed command to replace tokens in a file with values from environment variables like so:

export my_var=foo
echo "something {{my_var}} bar" | sed -r "s/\{\{(.*?)\}\}/$\1/g"
I want to grab the name of the token (my_var in this case) and then substitute in the value of the environment variable with the same name.

Is this possible? Current the above prints something $my_var bar rather than something foo bar which is what I want.

I'm open to using another tool such awk instead if it's not possible with sed.

[Janos Gyerik]

Perhaps you could post your question on Stack Overflow or Unix SE. Once you have your one-liner working well, it will be cool on bashoneliners.com

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