Bird
0
0

What will be the output when you run this script named greet.sh?

medium📝 Command Output Q13 of 15
Bash Scripting - Basics
What will be the output when you run this script named greet.sh?
#!/bin/bash
echo "Hello, $USER!"
ASyntax error
BHello, root!
CHello, $USER!
DHello, your-username!
Step-by-Step Solution
Solution:

  1. Step 1: Understand the variable $USER in bash

    $USER is an environment variable that holds the current user's username.

  2. Step 2: Predict the echo output

    The echo command prints "Hello, " followed by the username, so it outputs "Hello, your-username!" where your-username is the actual user.

  3. Final Answer:

    Hello, your-username! -> Option D

  4. Quick Check:

    $USER expands to username = Hello, your-username! [OK]
Quick Trick: Variables like $USER show your username in scripts [OK]
Common Mistakes:
MISTAKES
  • Thinking $USER prints literally
  • Expecting 'root' always
  • Confusing syntax causing errors

Want More Practice?

15+ quiz questions · All difficulty levels · Free

Free Signup - Practice All Questions
More Bash Scripting Quizzes
Bash Scripting Basics - Shebang line (#!/bin/bash) - Quiz 3easy Conditionals - if-then-fi structure - Quiz 11easy Conditionals - Integer comparisons (-eq, -ne, -gt, -lt, -ge, -le) - Quiz 11easy Conditionals - if-elif-else - Quiz 11easy Conditionals - [[ ]] extended test - Quiz 13medium Conditionals - String comparisons (=, !=, -z, -n) - Quiz 7medium Quoting and Expansion - Why quoting rules prevent errors - Quiz 2easy Quoting and Expansion - Backticks and $() for command substitution - Quiz 15hard User Input - Default values for input - Quiz 1easy User Input - read command - Quiz 1easy