rc/sh/bin

#!/usr/bin/env zsh
# compat: +ash +bash +dash +hush -ksh +mksh +oksh +osh +posh +yash +zsh

# though technically compatible with other shells,
# extra functionality is through zsh's extended arithmetic functions.

bin() { ### @-
    ### perform arithmetic using the shell and display the result as
    ### an unsigned 8-bit integer in binary.
    ### see also [`arith`](#arith) and [`hex`](#hex).
    ###
    ### ```
    ### $ bin 123
    ### 01111011
    ### ```
    local a="$(($@))"
    a="$(( (((((((((((((a + 0x0FFFFF80) & 0x1000007F) + 0x00FFFFC0) & 0x1100003F) + 0x000FFFE0) & 0x1110001F) + 0x0000FFF0) & 0x1111000F) + 0x00000FF8) & 0x11111007) + 0x000000FC) & 0x11111103) + 0x0000000E) & 0x11111111 ))"
    printf "%08X\n" "$a"
}

[ -n "${preload+-}" ] || bin "$@"