Linux使用 -- 帮助命令

man

  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), e.g. man(7), groff(7)
  8. System administration commands (usually only for root)
  9. Kernel routines [Non standard]
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$ ls /usr/bin/passwd /etc/passwd
/etc/passwd /usr/bin/passwd

$ man 1 passwd
$ man 5 passwd
$ man -a passwd

help

  1. shell(命令解析器)自带的命令称为内部命令,其它的是外部命令
  2. 内部命令:help cd
  3. 外部命令:ls --help
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$ type cd
cd is a shell builtin

$ type ls
ls is aliased to `ls --color=auto'

info

  1. info比help更详细info ls
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