The current login shell has a nice value of 0.
Start an ordinary child process without nice or renice.
Which nice value does the child inherit?
Linux child processes inherit the parent's nice value. With a parent value of 0 and no explicit adjustment, the child starts at 0.
Detailed explanation
Correct. The child inherits the shell's nice value of 0.
Incorrect. 10 is a common adjustment used by nice when no value is specified, not the unchanged inherited value.
Incorrect. 19 is the lowest scheduling priority value, not the default.
Incorrect. -20 is the highest-priority direction and is not the default.
Try it yourself
An example you can run in a temporary verification environment.
bash -c 'ps -o ni= -p "$$"'Expected result
通常は0（呼出し元シェルのnice値を変更していない環境）Key points
- Children inherit the parent's nice value
- The ordinary default is 0
- nice changes the value explicitly
Notes
- Environment: Linux / procps-ng
- 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.