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Say I have a command that puts me into a subshell (e.g. nix-shell). If I have a bash script that goes

enter-subshell
echo hi

the echo hi will wait to be executed until I exit the subshell. Is there any way to write a script that behaves the same as manually typing out both lines in order? In other words, subsequent commands get executed in the newly invoked shell?

Edit: it seems what I'm looking to do doesn't have a general solution.

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    what is "enter-subshell"? if it's "nix-shell" there is a solution. if it is different the may be a different solution.
    – Jasen
    Mar 10, 2021 at 3:00
  • Are you looking for the --run option to nix-shell? nix-shell --run "echo hi"
    – Kusalananda
    Mar 13, 2021 at 22:14

1 Answer 1

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You'll have to create a script and invoke that shell calling your script as a parameter. For example:

$ echo "echo hi" > my_echo.subshell
$ echo "enter-subshell -c my_echo.subshell" > my_script.bash
$ ./my_script.bash

The way to pass parameters to the subshell (in my example "-c") will depend on your subshell, each shell might use a different parameter.

As an alternative, if you don't want to create a second script, you can also redirect instructions to the shell. It will also vary and depend on the shell you want to call. For example:

enter-subshell -e <<EOF
echo hi
EOF

For this method, you can read more on "Here Documents". Again, you will find the proper way of executing the specific subshell (in my example "-e").

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  • You're probably going to want <<'EOF' for another shell script. Mar 10, 2021 at 3:20
  • @MichaelHomer I think parsing of the outside script takes precedence, doesn't it? I'm not sure.
    – msb
    Mar 10, 2021 at 3:23

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