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sober (853B)

      1 #!/bin/sh
      2 # Simple sobriety checker inspired by DrunkGuard.
      3 
      4 NCHECKS=3
      5 DRUNKSFILE=/tmp/drunks
      6 
      7 die() {
      8 	echo "$@"
      9 	exit 1
     10 }
     11 
     12 rnd() {
     13 	nofd="$1" # n. of digits
     14 	cset="$2" # character set
     15 	[ -z "$nofd" ] && nofd=1
     16 	[ -z "$cset" ] && cset="[:digit:]"
     17 	dd if=/dev/urandom of=/dev/stdout bs=4096 count=1 2>/dev/null |tr -dc "$cset" |head -c "$nofd"
     18 }
     19 
     20 check() {
     21 	n1="$(rnd)"
     22 	n2="$(rnd)"
     23 	sum="$(echo "${n1}+${n2}" | bc)"
     24 	printf "How much is %d + %d? " "$n1" "$n2"
     25 	read r
     26 	nan="$(echo "$r" | grep -c '[^0-9]')"
     27 	[ "$nan" -eq 1 ] && return 1
     28 	[ "$r" -ne "$sum" ] && return 1
     29 	return 0
     30 }
     31 
     32 drunk() {
     33 	echo "$(date +'%d/%m/%Y %H:%M:%S') | $(id -un) | $@" >> "$DRUNKSFILE"
     34 	die "You're drunk, I'll take care of you."
     35 }
     36 
     37 main() {
     38 	[ "$#" -eq 0 ] && die "Are you sober?"
     39 	for i in $(seq 1 $NCHECKS); do
     40 		check
     41 		[ $? -ne 0 ] && drunk "$@"
     42 	done
     43 	$@
     44 }
     45 
     46 main "$@"