root inhibition

no_root.sh

#!/usr/bin/env sh

# Don't allow a given command to be run as root.
# This script will output an error message, in case the current
# user is identified as root (also works in case of 'sudo')

# do we have color ?
case "$TERM" in
  xterm*|rxvt*)
    read -r red RED blue BLUE cyan CYAN NC <<EOF
\033[0;31m \033[1;31m \033[0;34m \033[1;34m \033[0;36m \033[1;36m \033[0m
EOF
    ;;
esac

# don't allow root to run this command
if [ `whoami` = "root" ] ; then
  printf "${red}don't run '${cyan}$*${red}' as ${RED}root${red}!${NC}\n"
  exit 1
fi

# show time
eval $@