摘要：
man就是manual的缩写，用来查看Linux系统中自带的各种参考手册，手册页分为几个部分，如下：1 Executable programs or shell commands2 System calls (functions provided by the kernel)3 Library calls (functions within program libraries)4 Special files (usually found in /dev)5 File formats and conventions eg /etc/passwd6 Games7 Miscellaneous (in 阅读全文