Linux CLI - File and Directory Operations
You want to create empty files named
day1.txt through day5.txt quickly. Which command achieves this?You want to create empty files named day1.txt through day5.txt quickly. Which command achieves this?
hard📝 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Understand brace expansion in shell
Brace expansion like {1..5} generates a sequence of strings, so day{1..5}.txt expands to day1.txt day2.txt ... day5.txt.Step 2: Evaluate options
touch day{1..5}.txt uses brace expansion correctly. touch day[1-5].txt uses character class which matches single characters, not sequence. touch day{1-5}.txt uses invalid brace range syntax (missing ..). touch day*.txt uses wildcard which matches existing files, not create new ones.Final Answer:
touch day{1..5}.txt -> Option AQuick Check:
Brace expansion creates multiple files quickly = B [OK]
Quick Trick: Use brace expansion {1..5} to create numbered files fast [OK]
Common Mistakes:
- Using character classes instead of brace expansion
- Using wildcard which matches existing files
- Using invalid brace range like {1-5}
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