`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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Cat is a bash built-in, but normally disabled.
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Check the sources
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I'm just at lunch. When back at the console I give you details, if you like.
End of conversation
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