When a new application is installed its documentation is also installed. This documentation is stored under the directory named for application. For example if my application name is App1 then the path of the documentation will be /user/doc/App1. It contains all the information about the application. It contains date of creating application, name of application and other important module of the application. We can get the basic information of application from the documentation.
How shadow passwords are given?
pwconv command is used for giving shadow passwords. Shadow passwords are given for better system security. The pwconv command creates the file /etc/shadow and changes all passwords to â€˜xâ€™ in the /etc/passwd file. First, entries in the shadowed file which donâ€™t exist in the main file are removed. Then, shadowed entries which donâ€™t have `xâ€™ as the password in the main file are updated. Any missing shadowed entries are added. Finally, passwords in the main file are replaced with `xâ€™. These programs can be used for initial conversion as well to update the shadowed file if the main file is edited by hand.