HOWTO- Apache "httpd" authentication in Linux

Create a directory on "apache" document root,which is "/var/www/html"

mkdir /var/www/html/admin
cd /var/www/html/admin

Create simple "index.html" page.

Now, Open "/etc/httpd/conf/httpd.conf" file and add/modify following lines.

Options Indexes Includes
AllowOverride AuthConfig

Create ".htaccess" file in "/var/www/html/nishith/.htaccess" & add below lines.
AuthType Basic
AuthName "My Private Page"
AuthUserFile /etc/httpd/conf/.htaccess
require valid-user

Now, Create/Add new user to access "/var/www/html/admin" page

htpasswd -mc /etc/httpd/conf/htpasswd nishith
New password:
Re-type new password:
Adding password for user nishith

View the content of "htpasswd" file
cat /etc/httpd/conf/htpasswd
nishith:$apr1$akwCX...$c3uo.k4oHIQNzlSEDQYMh0

Note:-
To add few more user we should use only -m, the -c option will create the file always, but as the file exist so do not use -cm option once the file was created.

htpasswd -m /etc/httpd/conf/htpasswd alex
New password:
Re-type new password:
Adding password for user alex

cat /etc/httpd/conf/htpasswd
nishith:$apr1$akwCX...$c3uo.k4oHIQNzlSEDQYMh0
alex:$apr1$70g94/..$m8QyD4gQisd265nLW7pbR0

Finally, access your webpage in your browser by typing,
http://ip address/admin (from remote pc)

OR

http://localhost/admin ( from local pc only)