Improve misc implementation in Bash #496

Job	Run time
install-cross (linux-musl)	8s
macos (stable, x86_64-apple-darwin)	38s
macos (beta, x86_64-apple-darwin)	1m 2s
linux (stable, arm-unknown-linux-gnueabi)	1m 4s
linux (stable, armv7-unknown-linux-gnueabihf)	1m 4s
linux (stable, i686-unknown-linux-musl)	2m 3s
linux (stable, x86_64-unknown-linux-musl)	3m 20s
linux (stable, aarch64-unknown-linux-gnu)	1m 8s
linux (stable, aarch64-unknown-linux-musl)	1m 7s
linux (stable, arm-unknown-linux-gnueabihf)	1m 39s
linux (beta, arm-unknown-linux-gnueabi)	1m 47s
linux (beta, armv7-unknown-linux-gnueabihf)	1m 10s
linux (beta, i686-unknown-linux-musl)	1m 17s
linux (beta, x86_64-unknown-linux-musl)	3m 19s
linux (beta, aarch64-unknown-linux-gnu)	1m 49s
linux (beta, aarch64-unknown-linux-musl)	1m 30s
linux (beta, arm-unknown-linux-gnueabihf)	1m 12s
	25m 17s

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