You want to create a script that reads a list of usernames from users.txt and writes a greeting for each user into greetings.txt. Which script snippet correctly does this?

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Bash Scripting - File Operations in Scripts

You want to create a script that reads a list of usernames from users.txt and writes a greeting for each user into greetings.txt. Which script snippet correctly does this?

Awhile read user; do echo "Hello, $user!" >> greetings.txt; done < users.txt

Bfor user in users.txt; do echo "Hello, $user!" > greetings.txt; done

Ccat users.txt | echo "Hello, $user!" > greetings.txt

Decho "Hello, $(cat users.txt)!" > greetings.txt

Step-by-Step Solution

Solution:

Step 1: Understand reading lines from a file
The 'while read user; do ... done < users.txt' reads each line (username) from users.txt correctly.
Step 2: Check writing greetings
Inside the loop, echo appends a greeting line to greetings.txt for each user.
Final Answer:
while read user; do echo "Hello, $user!" >> greetings.txt; done < users.txt -> Option A
Quick Check:
Loop reads lines and appends greetings [OK]

Quick Trick: Use while read loop with input redirection and append >> [OK]

Common Mistakes:

MISTAKES

Using for loop incorrectly on filename instead of lines
Overwriting greetings.txt inside loop instead of appending
Misusing cat with echo without looping

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More Bash Scripting Quizzes

You want to create a script that reads a list of usernames from users.txt and writes a greeting for each user into greetings.txt. Which script snippet correctly does this?

Step 1: Understand reading lines from a file

Step 2: Check writing greetings

Final Answer:

Quick Check:

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