This is a transparent wrapper that pretty much does nothing (aka it passthrough and eval all arguments). This is useful in-place of `sudo`, where you might have sudo-right (e.g. inside a container) but cannot perform `setuid` (because you are not actually sudo or using fakeroot as far as the host-machine's concern).

transparent_wrapper

#!/bin/sh

requote_args() {
  # Given a list of args, add quotes if necessary
  C=''
  for i in "$@"; do
    case "$i" in
      *[[:space:]]*|*'*'*)  # contain space or literal astrisk
        case "$i" in
          *\'*)  # escape single quote
            i="$(printf "%s" "$i" | sed "s/'/'\"'\"'/g")"
            ;;
          *) : ;;
        esac
        # quote only the parts after equal sign
        # i.e. in the format of pre='echo foo && echo bar'
        case "$i" in
          *=*)  # escape single quote
            i="${i%%=*}='${i#*=}'"
            ;;
          *)  # normal case
            i="'$i'" ;;
        esac ;;
      *) # no space, do nothing
        : ;;
    esac
    if [ -z "$C" ]; then
      C="$i"
    else
      C="$C $i"
    fi
  done
  printf "%s" "$C"
}

eval "$(requote_args "$@")"

If this is save as /usr/bin/sudo, it will works with

sudo echo Hi

as well as

sudo FOO=bar echo Hi

where the second one will fail if you don't do eval (and won't works correctly if you don't requote the arguments).