Anybody know how to use a bash variable in an `Exec` task’s command? Escaping the dollar sign doesn’...

# gradle

[Gabriel Feo]

Anybody know how to use a bash variable in an Exec task’s command? Escaping the dollar sign doesn’t seem to work. For example:

commandLine = listOf("echo", "Declared in env GOOGLE_APPLICATION_CREDENTIALS=\$GOOGLE_APPLICATION_CREDENTIALS")

Output:

Declared in env GOOGLE_APPLICATION_CREDENTIALS=$GOOGLE_APPLICATION_CREDENTIALS

[octylFractal]

call bash with -c, rather than using exec directly

[octylFractal]

e.g. listOf("bash", "-c", "echo 'Declared in env ...')

[Fleshgrinder]

Everything inside the list you create is escaped, no matter what you do. It's equivalent to the following Bash line 'echo' 'Declared in env GOOGLE_APPLICATION_CREDENTIALS=$GOOGLE_APPLICATION_CREDENTIALS' and nothing gets interpreted. Do what @octylFractal said or use System.getenv.

[octylFractal]

realistically, it's not equivalent to a bash anything, it's likely doing something similar to execve & friends -- that means that it's not using any bash builtins such as echo or cd

[Fleshgrinder]

Equivalence depends on how you exactly define it. The observable side effects and logical interpretation is equivalent. 😉

[octylFractal]

I suppose that depends on what you mean by "observable side effects" -- builtin echo and e.g. /usr/bin/echo can behave differently, but don't in most cases 😛

[Fleshgrinder]

They all print something to STDOUT.

[Fleshgrinder]

You are not wrong with your statement! Just saying that my statement for explanation is not wrong either.

[Gabriel Feo]

Thank you both! :)