Quiz · 3 questions
💻 Advanced Patterns and macOS Specifics
Brace expansion, parameter expansion, process substitution, macOS
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Quiz
01Why does
mkdir -p project/{src,test,docs} work even when none of those subdirectories exist?Hint
Brace expansion happens before glob expansion and runs even on nonexistent paths.
02What does
${var:-default} mean?Hint
The form
${var:-default} substitutes only when var is unset or empty.03Why use
diff <(cmd1) <(cmd2) instead of saving outputs to temp files?Hint
macOS-only utilities for clipboard and Finder bridging.
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