you need to stop
`cat` using only bash built-ins, binary-safe (and extremely slow): while LANG=C IFS= read -rd $'\0' -n 1 a; do ([ -z "$a" ] && echo -ne '\x00' || echo -n "$a") ; done <input >output
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For what purpose (°᷄д°᷅)
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with zsh it's pretty boring: echo -n "$(<input)" >output
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I thought echo was not a built-in but separate binary. However printf is a built-in. Also [ -z ..] invokes test(1) but the [[ ]] does not (I believe)
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Everything in that tweet is built in. I checked with strace just to be sure. All of printf, [, test, echo are listed in the bash manpage as builtins.
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Lovely
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Cat is a bash built-in, but normally disabled.
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No it's not. Check the manpage.
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So at least Debian doesn not have the 'cat' builtin packaged. But if you build bash from source including the loadables, you can enable -f ~/src/bash/examples/loadables/cat cat See https://gitlab.com/gnuwget/wget2/wikis/Developer-hints:-Increasing-speed-of-GNU-toolchain … for instructions.
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Interesting. Though if it's not there by default in typical distro it might as well not exist. The point of my snippet was for weird situations where you have to work with builtins only on an existing system :-)
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