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51. What Are The Options Available To Determine The Group ID Of The New File?
Date Posted: 07/02/2012
Ans:
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The group ID of the new file can be the effective group ID of the process
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The group ID of the new file can be the group ID of the directory in which the file is being created.
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52. List Down The Different File Types?
Date Posted: 07/02/2012
Ans:
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Regular file
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Directory file
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Character special file
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Block special file
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FIFO
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Symbolic link
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Socket
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53. Define 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.
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54. Define 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.
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55. What 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.
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56. Define 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.
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57. Define 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.
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58. How Do You Find Out The Current Directory You’re In?
Date Posted: 07/02/2012
Ans: Pwd.
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59. What Are The Different Security Features In UNIX?
Date Posted: 07/02/2012
Ans:
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Password protection
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File permissions
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Encryption.
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60. What 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.
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