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standard output
 (
stdout
), 
standard error
 (
stderr
), and 
standard input
 (
stdin
) in the previous chapter. We'll use standard input again here, 
when we capture input to store it as a variable. Try this command for example:
read age
When you run this command, you'll just be brought to a blank line, with no 
indication as to what you should be doing. Go ahead and enter your age, and then 
press 
Enter
. Next, run this:
echo $age
In a script, you would want to inform the user what they should be entering, so you 
would probably use something similar to these commands:
echo "Please enter your age"
read age
echo "Your age is $age"
We've discussed standard input in the previous chapter, and we can see it in action 
again here as we capture input from the user and store it in a variable.

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Boosting Your Command-line Efficiency