Linuxに入っているコマンドをランダムに表示するshellを作った

#!/bin/sh

echo "Do you know how to use: '"$(compgen -c | gshuf -n 1)"'?"
read -p "Yes or No?(y/n)" -n 1 -r
echo 
if [[ $REPLY =~ [[Yy]$ ]]
then 
  echo "Cool! Post your knowledge to your blog or favorite site."
else 
  echo "OK, study it and then post about that."
fi

$ ./command-questions.sh 
Do you know how to use: 'ldapsearch'?
Yes or No?(y/n)n
OK, study it and then post about that.

$ ./command-questions.sh 
Do you know how to use: 'sort'?
Yes or No?(y/n)y
Cool! Post your knowledge to your blog or favorite site.