e.g. whatis passwd
Usage: man [SECTION] COMMAND
| SECTION | Meaning |
|---|---|
| 1 | Executable programs or shell commands |
| 2 | System calls (functions provided by the kernel) |
| 3 | Library calls (functions within program libraries) |
| 4 | Special files (usually found in /dev) |
| 5 | File formats and conventions eg /etc/passwd |
| 6 | Games |
| 7 | Miscellaneous (including macro packages and conventions) |
| 8 | System administration commands (usually only for root) |
| 9 | Kernel routines [Non standard] |
e.g. ls --help
/usr/share/doc
Red Hat Documentation
- Installation Guide
- Deployment Guide
- Virtualization Guide
- Knowledge base: http://kbase.redhat.com/
- Common questions and their solutions
- Deployment Guide:
- System->Documentation->Deployment Guide
- yelp ghelp:Deployment_Guide
原文：https://www.cnblogs.com/zakzhu/p/11632996.html