如何在手册页中搜索 `!`（感叹号）？

Question

我想要得到的解释!选项（这意味着排除在）find命令的man find。

然后我按下/和shift + 1，Non-match弹出一个，而不是! 所以我的问题是如何!在联机帮助页中搜索？

Answer 1

默认man寻呼机是less. 如果您查看less的帮助（h在其中按下），您会看到：

                          SEARCHING

  /pattern          *  Search forward for (N-th) matching line.
  ?pattern          *  Search backward for (N-th) matching line.
  n                 *  Repeat previous search (for N-th occurrence).
  N                 *  Repeat previous search in reverse direction.
  ESC-n             *  Repeat previous search, spanning files.
  ESC-N             *  Repeat previous search, reverse dir. & spanning files.
  ESC-u                Undo (toggle) search highlighting.
  &pattern          *  Display only matching lines
        ---------------------------------------------------
        A search pattern may be preceded by one or more of:
        ^N or !  Search for NON-matching lines.

或在man less：

/pattern
      Search forward in the file for the N-th line containing the pat?
      tern.  N defaults to 1.  The pattern is a regular expression, as
      recognized  by  the  regular expression library supplied by your
      system.  The search starts at the first line displayed (but  see
      the -a and -j options, which change this).

      Certain  characters  are  special if entered at the beginning of
      the pattern; they modify the type of search rather  than  become
      part of the pattern:

      ^N or !
             Search for lines which do NOT match the pattern.

所以， just 的模式!是一个空模式（它匹配任何东西）被否定- 所以没有任何东西可以匹配它。

您必须!通过使用反斜杠 ( \!) 或以其他方式使其不是正则表达式的第一个字符 (/[!]例如 )来逃避模式开头的重要性。

另一种方法是使用grep：

$ man find | grep !
       with  `-', or the argument `(' or `!'.  That argument and any following
       ! expr True  if  expr  is false.  This character will also usually need
              Same as ! expr, but not POSIX compliant.
       The POSIX standard specifies parentheses `(', `)', negation `!' and the
       find /sbin /usr/sbin -executable \! -readable -print
       find . -perm -444 -perm /222 ! -perm /111
       find . -perm -a+r -perm /a+w ! -perm /a+x
       -perm  /222 or -perm /a+w) but are not executable for anybody ( ! -perm
       /111 and ! -perm /a+x respectively).
       find . -name .snapshot -prune -o \( \! -name *~ -print0 \)|

Answer 2

您需要在输入\之前输入!，以免在搜索中被解释为否定正则表达式。