Linux Man Command Utilities
Man pages(short form for manual pages)are the documentation its pre installed with almost all Unix-like operating systems(red-hat,Debian,ubuntu.,).The man command is used to display the documents. Each page is a self-contained document.
The following section numbers of the manual followed by the types of pages they contain.
1 Executable programs or shell commands (or) User-level commands
2 System calls (functions provided by the kernel)
3 Library calls (functions within program libraries)
4 Special files (or) Devices and device drivers
5 File formats and conventions e.x:-/etc/group
7 Miscellaneous (or) Various miscellaneous stuff – macro packages etc.(including macro packages &conventions), e.x:-man(7)
8 System administration commands (or) System maintenance and operation commands(usually only for root)
9 Kernel routines [Non standard]
To Create a PDF document for man page
man -t (command) | ps2pdf -> (command).pdf
man -t mkdir | ps2pdf -> mkdir.pdf