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std::process::Command can't echo environment variables #95400
Description
I tried this code:
use std::process::Command;
...
let s = Command::new("echo")
.arg("$123")
.output()
.expect("command failed");
println!("{}", String::from_utf8_lossy(&s.stdout));I expected to see this happen:
Print the content of the $123 environment variable
Instead, this happened:
It literally prints $123
Meta
rustc --version --verbose:
rustc --version --verbose
rustc 1.61.0-nightly (63b8f01bb 2022-03-24)
binary: rustc
commit-hash: 63b8f01bb5ca277e7df8d7efe094ed4244c1790c
commit-date: 2022-03-24
host: x86_64-unknown-linux-gnu
release: 1.61.0-nightly
LLVM version: 14.0.0
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Area: Documentation for any part of the project, including the compiler, standard library, and toolsArea: `std::process` (note: `std::env` is A-env)Category: An issue proposing an enhancement or a PR with one.Call for participation: Easy difficulty. Experience needed to fix: Not much. Good first issue.Relevant to the library team, which will review and decide on the PR/issue.
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crumblingstatue commentedon Mar 28, 2022
It is the shell that resolves environment variables. You're not using a shell here, just directly executing a command. This is behaving as expected.
jfrimmel commentedon Mar 28, 2022
Indeed, this is the expected behavior. This can be circumvented by actually using a shell, e.g. on POSIX:
wwylele commentedon Mar 28, 2022
I did a quick check on the doc for arg
I guess we can expand "substitution" into "variable substitution" to make it more clear.
Milo123459 commentedon Sep 25, 2023
so is this just a documentation change?
@rustbot claim
Rollup merge of rust-lang#116146 - Milo123459:milo/clarify-arg-docume…
Unrolled build for rust-lang#116146