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I try to execute echo ${GOPATH} with call-process as below:

(call-process "echo" nil t nil "${GOPATH}")

But it only output "${GOPATH}" not the value of that value. Would anyone please let me know what the correct way to do it?

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You're looking for (call-process-shell-command "echo ${GOPATH}" nil t nil). In this case, ${PATH} is syntax defined by a shell, not a native call, so you'll need to invoke a shell to interpret it.

However, you may be interested in (insert (getenv "GOPATH")) which is considerably more direct, as it simply reads the environment instead of spawning a shell to read the environment in its stead.

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    Good answer, but note that the environment Emacs sees is not necessarily the environment that your shell sees (generally depending on how and where Emacs is invoked).
    – phils
    Commented May 13, 2016 at 5:09
  • @phils ah. Thanks for reminding me. I always spawn Emacs from a shell, so I forget.
    – PythonNut
    Commented May 13, 2016 at 5:11

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