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51List Down The Different File Types?
Date Posted: 07/02/2012


  • Regular file
  • Directory file
  • Character special file
  • Block special file
  • FIFO
  • Symbolic link
  • Socket

52Define Program And Process?
Date Posted: 07/02/2012

Ans: A program is a executable file residing in a disk file. An executing instance of a program is called a process. Every UNIX process has a unique numeric identifier called the process ID. The process ID is always a non negative integer.

53Define Directory And Filename?
Date Posted: 07/02/2012

Ans: A directory is a file that contains directory entries. The directory entry containing a file name along with structure of information describing the attributes of the file. The names in a directory are called filename. The only two characters that cannot appear in a file name are / and null character.

54What Is UNIX?
Date Posted: 07/02/2012

Ans: UNIX is the most popular operating system on multi-user systems. This operating system originated as a single-user system. It started off on a cast-off DEC PDP-7 at Bell laboratories in 1969. Ken Thompson, with ideas and help from Dennis Ritchie, and others, wrote a small, general-purpose operating system.

55Define Message Queue?
Date Posted: 07/02/2012

Ans: message queue Message queue is a linked list of messages. It is used to make a communication between the related or unrelated processes.

56Define Session?
Date Posted: 07/02/2012

Ans: A session is a collection of one or more process groups. A process establishes a new session by calling setsid function. This function returns process group id if OK.

57How Do You Find Out The Current Directory You’re In?
Date Posted: 07/02/2012

Ans: Pwd.

58What Are The Different Security Features In UNIX?
Date Posted: 07/02/2012


  • Password protection
  • File permissions
  • Encryption.

59What Is Kernel?
Date Posted: 07/02/2012

Ans: Kernel is core part of UNIX o/s. It is a group of hundreds of system calls.

60What Is A Shell
Date Posted: 07/02/2012

Ans: A shell is an interactive user interface to an operating system service that allows an user to enter commands as character strings or through a graphical user interface. The shell converts them to system calls to the OS or forks off a process to execute the command. System call results and other information from the OS are presented to the user through an interactive interface. Commonly used shells are sh, csh, ks etc.

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