Question

What is a working set?

What is the first line of every bash script?

What is the permission string (RWXRWXRWX format) of the number 311

What is the base directory of a file system called on windows, and on linux

What does the term 'super user' mean in terms of operating systems

Answer 1

Following is the answer:

What is a working set?
A working set is a logical collection of projects, which you can use to limit the number of resources that are displayed in the Application Development view. By creating and using a working set, you can reduce the visual complexity of what is displayed in the Application Development view, making it easier to manage and work with your projects.

What is the first line of every bash script?
The first line of the script is important. This is a special clue, called a shebang, given to the shell indicating what program is used to interpret the script. In this case, it is /bin/bash. Other scripting languages such as Perl, awk, tcl, Tk, and python also use this mechanism.
bash and sh are two different shells. Basically bash is sh, with more features and better syntax. Most commands work the same, but they are different.
example:
#!/bin/sh — Execute the file using sh, the Bourne shell, or a compatible shell
#!/bin/csh — Execute the file using csh, the C shell, or a compatible shell
#!/usr/bin/perl -T — Execute using Perl with the option for taint checks
#!/usr/bin/php — Execute the file using the PHP command line interpreter
#!/usr/bin/python -O — Execute using Python with optimizations to code
#!/usr/bin/ruby — Execute using Ruby

What is the permission string (RWXRWXRWX format) of the number 311
311 -> _WX__X__X

What is the base directory of a file system called on windows, and on linux
/User is the base directory of a file system called on windows and
/(root) is the base directory of a file system called on linux

What does the term 'super user' mean in terms of operating systems
A superuser is a special user account for general system administration such as in networks and databases. It is a variation of the administrator user, which varies depending on the operating system and context.
On a Unix system, the superuser refers to a privileged account with unrestricted access to all files and commands. The username of this account is root. Many administrative tasks and their associated commands require superuser status.

There are two ways to become the superuser. The first is to log in as root directly. The second way is to execute the command su while logged in to another user account. The su command may be used to change one's current account to that of a different user after entering the proper password. It takes the username corresponding to the desired account as its argument; root is the default when no argument is provided.