You want to rename multiple files by adding a prefix old_ to all .txt files in the current directory using a script. Which approach correctly uses mv inside a loop?

hard📝 Application Q9 of 15

Linux CLI - File and Directory Operations

You want to rename multiple files by adding a prefix old_ to all .txt files in the current directory using a script. Which approach correctly uses mv inside a loop?

Afor f in *.txt; do mv "$f" "old_$f"; done

Bmv *.txt old_*.txt

Cfor f in old_*.txt; do mv "$f" "$f"; done

Dmv old_*.txt *.txt

Step-by-Step Solution

Solution:

Step 1: Understand batch renaming with mv
To rename multiple files, loop over them and rename each individually.
Step 2: Analyze options
for f in *.txt; do mv "$f" "old_$f"; done loops over all .txt files and renames each by adding prefix old_.
Final Answer:
for f in *.txt; do mv "$f" "old_$f"; done -> Option A
Quick Check:
Loop + mv per file = batch rename [OK]

Quick Trick: Use for loop with mv to rename multiple files [OK]

Common Mistakes:

MISTAKES

Trying to mv multiple files with wildcards in one command
Looping over wrong filenames
Not quoting variables causing errors with spaces

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You want to rename multiple files by adding a prefix old_ to all .txt files in the current directory using a script. Which approach correctly uses mv inside a loop?

Step 1: Understand batch renaming with mv

Step 2: Analyze options

Final Answer:

Quick Check:

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