Pass four items a, b, c, and d to xargs.
Run echo with at most two input-derived items each time, producing two lines.
Which command list is correct?
xargs -n N limits the number of input-derived arguments per command invocation. The input may therefore cause several executions.
Detailed explanation
printf 'a
b
c
d
' | xargs -L 2 echoIncorrect. -L 2 groups by input lines, which is not the same as two whitespace-separated arguments in general.
Incorrect. -L 2 groups by input lines, which is not the same as two whitespace-separated arguments in general.
printf 'a
b
c
d
' | xargs -P 2 echoIncorrect. -P 2 controls parallel execution, not the number of arguments per run.
Incorrect. -P 2 controls parallel execution, not the number of arguments per run.
printf 'a
b
c
d
' | xargs -n 2 echoCorrect. -n 2 runs echo twice with two items each.
Correct. -n 2 runs echo twice with two items each.
printf 'a
b
c
d
' | xargs -I 2 echoIncorrect. -I requires an explicit replacement string and does not mean two arguments.
Incorrect. -I requires an explicit replacement string and does not mean two arguments.
Try it yourself
An example you can run in a temporary verification environment.
printf 'a
b
c
d
' | xargs -n 2 echoExpected result
a b
c dKey points
- -n sets the maximum argument count
- Multiple invocations are expected
- -P controls parallelism instead
Notes
- Environment: GNU findutils 4.x
- Command output formatting can vary slightly by distribution or tool version.
- Run the example in a temporary directory or process when possible.
Foundation review
Read the scope first
Check whether the command acts on the current shell, a new process, an existing process, or a file.
Verify the observable result
Use the supplied command and compare the output with the expected result.