Get help in Linux

In Linux, commands that obtain HELP in Linux can use the-h or -- help parameters to obtain usage methods and parameters. For example, ls can use -- help, cd can be used to obtain help information with-h. "[]" indicates the optional parameter manLinux's famous "Find a man" Format: man to search for content. For example, man ls. To view the detailed usage of ls, man can also find the library function documentation. For example, man scanfman is divided into many types (numbers of types) type 1 USER command 2 kernel system call 3 library function 4 special files and devices 5 file formats and Specifications 6 Game 7 specifications and other pages 8 system management commands 9 Linux kernel API can use man numbers query content, queries within the specified range. for example, man 2 fork. In the kernel system call documentation, search for the fork man-k keyword and find the document INFO with the keyword, which is similar to the command, however, for more detailed information, man and info can be searched by "/+ keyword". Many programs and commands contain detailed documents, which are generally stored in/usr/share/DOC.