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From: "Felix E. Klee" <felix.klee@inka.de>
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Subject: Backticks in Eshell
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To generate a one time password, I would do in Bash:

    oathtool -b --totp `gpg -d secret.gpg`

How do I do the equivalent in Eshell?

I tried:

    oathtool -b --totp ${gpg -d secret.gpg}

But that doesn’t work.  Even the following doesn’t work:

    echo ${gpg -h}

I expect GnuPG’s help text, but there’s no output.