Read File Module with multi-process, mainly to deal with big file.
Written in PHP language.
Extension needed: pcntl, posix.
System support: UNIX/Linux/MacOS, but no Windows (because Windows has no pcntl extension).
Usage: php file_pcntl.php file_path proc_num [max_mem]
For example: php file_pcntl.php test.log 4 20
Note: Memory size is calculated in B(Byte).