Linux basics: get help

Basics of Linux: getting help doesn't have to remember everything. Linux provides very detailed help tools and documents, so you must get used to poor help documents, this greatly reduces the need to remember and improves the efficiency of Help. Almost all commands can use the-h or -- help parameter to obtain the usage method, parameter information and other $ commands -- help or $ command-h man $ man help document obtained by command man is more detailed than -- help man is the most commonly used help command in Linux, you can run the man command as a parameter to obtain the help documentation. Man documents are divided into many types: Part 1 USER command 2 kernel system call 3 library function 4 special files and Device 5 file formats and Specifications 6 Game 7 specifications, standard and other pages 8 system management commands 9 Linux kernel API man-k keywords can be used to query documents containing this keyword $ man-k passwd will list all documents containing passwd keywords infoinfo and man similarly, but the information provided is more detailed than man! Provide man and info in the form of similar web pages. You can search for many DOC programs by using the "/+ keyword" method. The commands all contain detailed help documents, in the form of txt, html, pdf and other methods are stored in the/usr/share/doc directory. These documents are the most detailed documents of the corresponding program.