获取有关Linux shell内置命令的帮助

你可以通过向 help 命令提供你感兴趣的内置命令名称来获取关于它们的更多信息，例如 help dirs：

$ help dirs
dirs: dirs [-clpv] [+N] [-N]
    Display directory stack.
 
    Display the list of currently remembered directories.  Directories
    find their way onto the list with the `pushd' command; you can get
    back up through the list with the `popd' command.
 
    Options:
      -c        clear the directory stack by deleting all of the elements
      -l        do not print tilde-prefixed versions of directories relative
                to your home directory
      -p        print the directory stack with one entry per line
      -v        print the directory stack with one entry per line prefixed
                with its position in the stack
 
    Arguments:
      +N        Displays the Nth entry counting from the left of the list
                shown by dirs when invoked without options, starting with
                zero.
 
      -N        Displays the Nth entry counting from the right of the list
                shown by dirs when invoked without options, starting with
                zero.
 
    Exit Status:
    Returns success unless an invalid option is supplied or an error occurs.

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