Swish++ is a Unix-based file indexing and searching engine, which is extremely fast in doing it’s job. Swish++ consists of two parts. Index++ can index wll your files with this command: index++ -e “text:*.txt” . (dot at the end required).

Search++ will simply search for a string you mentioned in the search with staistics of it’s [...]

sh: The Bourne shell, or sh, was the default Unix shell of Unix Version 7, and replaced the Thompson shell, whose executable file had the same name, sh. It was developed by Stephen Bourne, of AT&T Bell Laboratories, and was released in 1977 in the Version 7 Unix release distributed to colleges and universities. It [...]

By default, when you give a user access to the system with a shell, the user can have access to a lot more information that you would like to give out. Especially if the user is not confined to a severly restricted environment, like a chrootjail.
Find out what a user see in your system:
find / [...]

Software defect This is the most common one will encounter. A defect can be in operating system

software or application software. Defects in the OS are typically more worrisome, but an application defect can be just as troublesome. For example, a defect in a database management system (DBMS) that allows customers’ data to be viewed by [...]