added reference page for man command under basics section (ikong)

_commands/basics/man.md

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+---
+---
+
+man
+---
+`man` displays user manual pages that is by default built into Linux. Displays information about specified commands
+
+~~~ bash
+$ man git
+$ man grep
+$ man ls
+~~~
+
+<!--more-->
+
+### Useful Options / Examples
+
+### `man man`
+
+Displays information about how to use the `man` command as well as the options that can be used with it
+
+~~~ bash
+$ man man
+man(1)                                                                  
+NAME
+man - format and display the on-line manual pages
+SYNOPSIS
+man  [-acdfFhkKtwW]  [--path]  [-m system] [-p string] [-C config_file]
+[-M pathlist] [-P pager] [-B browser] [-H htmlpager] [-S  section_list]
+[section] name ...
+~~~
+
+
+### `man -k [keyword]`
+
+ `man -k [keyword]` searches all descriptions in manual pages for keyword and display any matches found.
+
+~~~ bash
+$ man -k grep
+git-grep(1)              - Print lines matching a pattern
+pcre2grep(1)             - a grep with Perl-compatible regular expressions
+pcregrep(1)              - a grep with Perl-compatible regular expressions
+xzgrep(1)                - search compressed files for a regular expression
+Tcl_NewObj(3tcl), Tcl_DuplicateObj(3tcl), Tcl_IncrRefCount(3tcl), Tcl_DecrRefCount(3tcl), Tcl_IsShared(3tcl), Tcl_InvalidateStringRep(3tcl) - manipulate Tcl objects
+grep(1), egrep(1), fgrep(1), zgrep(1), zegrep(1), zfgrep(1) - file pattern searcher
+pgrep(1), pkill(1)       - find or signal processes by name
+ptargrep(1)              - Apply pattern matching to the contents of files in a tar archive
+zipgrep(1)               - search files in a ZIP archive for lines matching a pattern
+~~~
+
+### `man -f [keyword]`
+
+`man -f [keyword]` is equivalent to the `whatis` command and if commands contain the keyword, it displays them as well as their short manual page descriptions.
+
+~~~ bash
+$ man -f grep
+git-grep(1)              - Print lines matching a pattern
+pcre2grep(1)             - a grep with Perl-compatible regular expressions
+pcregrep(1)              - a grep with Perl-compatible regular expressions
+grep(1), egrep(1), fgrep(1), zgrep(1), zegrep(1), zfgrep(1) - file pattern searcher
+~~~
+