CSCD240-S26-L04
Lecture 4. Command history, man pages, help system, history file
Delivered 2026-04-02
Key topics: ["history","man","!!","!n","Ctrl-R"]
Authority mappings
Knowledge Units:
CD-OSC Operating Systems Concepts
Exam questions that cite this lecture
- CSCD240-E1-A-Q32 help-system Explain man and --help. When to use each?
- CSCD240-E1-A-Q43 history-expansion Forgot sudo on previous command. Re-run with sudo prepended without retyping.
- CSCD240-E1-A-Q44 history Bash keystroke that begins reverse-incremental history search.
- CSCD240-E1-A-Q49 type-vs-which Tell if cd is a builtin, alias, function, or external program.
- CSCD240-E1-B-Q45 help-system Contrast man vs --help. When to use each.
- CSCD240-E1-B-Q46 type Show whether cd is a builtin / alias / function / external.
- CSCD240-E1-B-Q47 history Re-run the previous command with sudo prepended without retyping.
- CSCD240-E1-B-Q48 history Bash keystroke to begin reverse-incremental history search.
- CSCD240-E1-C-Q10 discovery Which command shows whether cd is a builtin, alias, function, or external?