`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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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)
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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In some old versions (can't name exact numbers, sorry) echo is not a built-in. Ran into this on some prehistoric unices and shot myself in the foot bcz some core .so files were corrupted due to messed up clustered filesystem.
Thanks. Twitter will use this to make your timeline better. UndoUndo
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