The command name is unknown.
Search manual-page names and short descriptions for the term password.
Which command is correct?
man -k searches the manual database by name and short description. It is useful when the function is known but the command name is not.
Detailed explanation
man passwordIncorrect. man password opens a page named password rather than searching descriptions.
man -f passwordIncorrect. -f looks up an exact command name and its one-line description.
man -k passwordCorrect. -k searches names and descriptions for the keyword.
which passwordIncorrect. which searches executable paths and does not search manual descriptions.
Try it yourself
An example you can run in a temporary verification environment.
man -k password | headExpected result
passwordを名前または短い説明に含むマニュアル候補Key points
- man -k
- man -f
- Difference from PATH lookup
Notes
- Environment: man-db 2.11以降（データベース構築済み）
- 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.