The shebang should be #!/usr/bin/env bash. For a reasoning just refer to https://stackoverflow.com/questions/10376206/what-is-the-preferred-bash-shebang. I think this issue has been discussed sufficiently for endless projects, please just note that both /bin/bash and /usr/bin/bash are not guaranteed to work (and indeed don't work on some Linux distributions), thus the only and best shebang for maximum compatibility is #!/usr/bin/env bash.

This seems to affect a bunch of different files in Redox. The following list includes files, which use a wrong shebang (changing the shebang for things which run in docker is not necessarily useful, but helps keeping everything tidy):

• docker/Dockerfile
• redox/bootstrap.sh
• redox/docker/Dockerfile
• redox/relibc/ci.sh
• redox/relibc/core_io/build-src.sh
• redox/relibc/core_io/doc.sh
• redox/relibc/core_io/edit-patches.sh
• redox/relibc/core_io/functions.sh
• redox/relibc/core_io/publish.sh
• redox/cookbook/recipes/bash/recipe.sh
• redox/cookbook/recipes/ca-certificates/make-ca.sh.patch
• redox/cookbook/patches/nix/ci/install.sh
• redox/cookbook/patches/nix/ci/script.sh
• redox/rust/src/etc/cpu-usage-over-time-plot.sh
• redox/rust/src/ci/run.sh
• redox/rust/src/bootstrap/dist.rs
• redox/rust/src/ci/scripts/checkout-submodules.sh
• redox/rust/src/ci/scripts/collect-cpu-stats.sh
• redox/rust/src/ci/scripts/disable-git-crlf-conversion.sh
• redox/rust/src/ci/scripts/dump-environment.sh
• redox/rust/src/ci/scripts/enable-docker-ipv6.sh
• redox/rust/src/ci/scripts/install-awscli.sh
• redox/rust/src/ci/scripts/install-clang.sh
• redox/rust/src/ci/scripts/install-mingw.sh
• redox/rust/src/ci/scripts/install-msys2-packages.sh
• redox/rust/src/ci/scripts/install-msys2.sh
• redox/rust/src/ci/scripts/install-innosetup.sh
• redox/rust/src/ci/scripts/install-ninja.sh
• redox/rust/src/ci/scripts/install-sccache.sh
• redox/rust/src/ci/scripts/install-wix.sh
• redox/rust/src/ci/scripts/run-build-from-ci.sh
• redox/rust/src/ci/scripts/should-skip-this.sh
• redox/rust/src/ci/scripts/switch-xcode.sh
• redox/rust/src/ci/scripts/upload-artifacts.sh
• redox/rust/src/ci/scripts/verify-line-endings.sh
• redox/rust/src/ci/scripts/windows-symlink-build-dir.sh
• redox/rust/src/tools/build-manifest/README.md
• redox/rust/src/test/run-make/git_clone_sha1.sh
• redox/rust/src/ci/docker/dist-various-2/build-cloudabi-toolchain.sh
• redox/rust/src/ci/docker/dist-various-2/build-x86_64-fortanix-unknown-sgx-toolchain.sh
• redox/rust/src/ci/docker/mingw-check/validate-toolstate.sh
• redox/rust/src/ci/docker/scripts/android-start-emulator.sh
• redox/rust/src/ci/docker/scripts/freebsd-toolchain.sh

Please consider changing the shebang wherever applicable (and never use /usr/bin or /bin/ as prefix for binaries in general, if not absolutely necessary). The reason why the $PATH variable exists is just to make rm work, regardless on which system you are ;)

To find all files with the issue, grep -R '#.*/bash' should be sufficient.