rc/sh/slit

#!/usr/bin/env dash
# YES_ZSH YES_BASH YES_DASH YES_ASH

# works with busybox ash.

slit() { ### @-
    ### view specific columns of text.
    [ $# -gt 0 ] \
     || { printf '%s: too few arguments\n' "$0" >&2; return 1; }
    local arg=
    for arg; do
        [ "$arg" -ge 0 ] 2>/dev/null \
         || { printf '%s: not a nonnegative integer: %s\n' "$0" "$arg"; return 1; };
    done
    awk "{ print $(printf ',$%s' $@ | cut -b2-) }"

    # via: https://github.com/sorin-ionescu/prezto/
    #awk "{ print ${(j:,:):-\$${^@}} }"
}

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