Quiz · 5 questions
🔧 Input, Output and Pipes
Streams, redirection, pipes, sort, uniq, xargs, tee
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Quiz
01What does
cmd 2>&1 > out.log actually do?Hint
&1 means "wherever stdout currently points" — order changes the answer.02Why is
uniq alone usually wrong?Hint
uniq only sees lines that touch each other.
03What does
set -o pipefail change?Hint
Without it, an early-stage failure can be masked by a later success.
04What's the safe pattern to feed
find results to xargs when filenames may contain spaces?Hint
Whitespace in filenames breaks word-splitting; NUL never occurs in a filename.
05What does
tee do?Hint
T-junction — one input, multiple outputs.
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