You can use the man command to read a man page from a local directory in Linux or Unix. By default, the man command searches for man pages in the system-wide man page directories. To read a man page from a local directory, you need to specify the path to the man page file using the -M or --manpath option.
For example, if you have a man page file example.1 in the directory /path/to/man, you can read the man page using the following command:
man -M /path/to/man example
Note that you need to provide the base name of the man page file without the section number (.1 in this case), and the man command will automatically look for the file with the correct section number in the specified directory.