20_whileloop.sh (930B)
1 #!/bin/sh 2 3 # A while loop is a way to run a command over and over again while a 4 # condition is true. The condition can be an evaluation or simply the 5 # word 'true'. Take these examples 6 # 7 # $ i=10 8 # $ while [ "$i" -ge 1 ]; do 9 # $ echo "$i" 10 # $ i=$((i - 1)) 11 # $ done 12 # 13 # The snippet above lists out all the integers from 10 until i equals 14 # 0. You can also use 'break' to stop that while loop 15 # 16 # $ evil_number=36 17 # $ count=1 18 # $ while true; do 19 # $ [ ! $count -eq $evil_number ] && echo "Not evil number" 20 # $ [ $count -eq $evil_number ] && break 21 # $ done 22 # $ echo "Evil number found" 23 # 24 # For your challenge, complete this game for the user. Do not change 25 # the correct number. 26 27 magic_number=2987133075769857928 28 echo "I'm thinking of a number between 1 and four hundred quintillion." 29 30 while True; 31 printf "Take a guess: " 32 read user_input 33 [ $magic_number -eq $user_input ] && break 34 echo "Nope, wrong." 35 36 echo "Got it, cheater"