Shulou(Shulou.com)06/02 Report--

Recently, when using man -f to check help information on a newly deployed server, I encountered "nothing appropriate". At that time, I thought that man was not installed, so I installed it with yum. As a result, I found that man was installed, so I went to look for the parameter option of man-f. There was this sentence "Equivalent to whatis." "Man -f actually uses whatis, so it uses whatis to find that it cannot be used, so man whatis finds this sentence:

The whatis database is created using the command /usr/sbin/makewhatis.

The original man -f is to use whatis or apropos, of course, these two instructions must be used by the root user to use, and the use of whatis or apropos must create a whatis database only line So run makewhatis and then use man -f to see the next normal, there is a point to note that if the system Centos7 version or above to establish an index library is mandb.

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