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Recent questions tagged unix

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In the UNIX environment what happens in the following three cases as shown in Fig. 1.

tenjela asked in Operating System May 12

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Fork System Call and Threads | OS | MSQ
MSQ Consider the following statements, which one of the following is/are TRUE In fork() system call, child process inherits all the open file descriptors of parent process In fork() system call, child process copies the code of the ... system call, child process shares the code of the parent process User level threads shares the code segment of the process

Souvik33 asked in Operating System Nov 28, 2022

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UGC NET CSE | January 2017 | Part 3 | Question: 51
Match the following for Unix file system : ... $\text{a-iv, b-iii, c-ii, d-i}$ $\text{a-iv, b-iii, c-i, d-ii}$

go_editor asked in Operating System Mar 24, 2020

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UGC NET CSE | January 2017 | Part 3 | Question: 54
Which statements is not correct about “init” process in Unix? It is generally the parent of the login shell. It has PID $1$. It is the first process in the system. Init forks and execs a ‘getty’ process at every port connected to a terminal.

go_editor asked in Operating System Mar 24, 2020

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Andrew S. Tanenbaum (OS) Edition 4 Exercise 5 Question 54 (Page No. 434)
A notebook computer is set up to take maximum advantage of power saving features including shutting down the display and the hard disk after periods of inactivity. A user sometimes runs UNIX programs in text mode, and ... She is surprised to find that battery life is significantly better when she uses text-only programs. Why?

Lakshman Bhaiya asked in Operating System Oct 28, 2019

by Lakshman Bhaiya

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6

Andrew S. Tanenbaum (OS) Edition 4 Exercise 5 Question 40 (Page No. 433)
Many versions of UNIX use an unsigned $32$-bit integer to keep track of the time as the number of seconds since the origin of time. When will these systems wrap around (year and month)? Do you expect this to actually happen?

Lakshman Bhaiya asked in Operating System Oct 28, 2019

by Lakshman Bhaiya

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7

Andrew S. Tanenbaum (OS) Edition 4 Exercise 5 Question 33 (Page No. 432)
A personal computer salesman visiting a university in South-West Amsterdam remarked during his sales pitch that his company had devoted substantial effort to making their version of UNIX very fast. As an example, he ... measured was identical to what would be expected from first-come, first-served. Was the salesman lying?

Lakshman Bhaiya asked in Operating System Oct 28, 2019

by Lakshman Bhaiya

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8

Andrew S. Tanenbaum (OS) Edition 4 Exercise 4 Question 47 (Page No. 336)
Implement a program to measure the impact of application-level buffer sizes on read time. This involves writing to and reading from a large file (say, $2$ GB). Vary the application buffer size (say, from $64$ ... results and report your findings: does buffer size make a difference to the overall write time and per-write time?

Lakshman Bhaiya asked in Operating System Oct 28, 2019

by Lakshman Bhaiya

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Andrew S. Tanenbaum (OS) Edition 4 Exercise 4 Question 46 (Page No. 336)
Write a new version of the UNIX ls program. This version takes as an argument one or more directory names and for each directory lists all the files in that directory, one line per file. Each field should be formatted in a reasonable way given its type. List only the first disk address, if any.

Lakshman Bhaiya asked in Operating System Oct 27, 2019

by Lakshman Bhaiya

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Andrew S. Tanenbaum (OS) Edition 4 Exercise 4 Question 45 (Page No. 336)
Write a program that scans all directories in a $UNIX$ file system and finds and locates all i-nodes with a hard link count of two or more. For each such file, it lists together all file names that point to the file.

Lakshman Bhaiya asked in Operating System Oct 27, 2019

by Lakshman Bhaiya

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11

Andrew S. Tanenbaum (OS) Edition 4 Exercise 4 Question 30 (Page No. 335)
It has been suggested that the first part of each UNIX file be kept in the same disk block as its i-node. What good would this do?

Lakshman Bhaiya asked in Operating System Oct 27, 2019

by Lakshman Bhaiya

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12

Andrew S. Tanenbaum (OS) Edition 4 Exercise 4 Question 28 (Page No. 335)
We discussed making incremental dumps in some detail in the text. In Windows it is easy to tell when to dump a file because every file has an archive bit. This bit is missing in $UNIX.$ How do $UNIX$ backup programs know which files to dump?

Lakshman Bhaiya asked in Operating System Oct 27, 2019

by Lakshman Bhaiya

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13

Andrew S. Tanenbaum (OS) Edition 4 Exercise 4 Question 4 (Page No. 333)
Is the open system call in $UNIX$ absolutely essential? What would the consequences be of not having it?

Lakshman Bhaiya asked in Operating System Oct 26, 2019

by Lakshman Bhaiya

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14

Andrew S. Tanenbaum (OS) Edition 4 Exercise 4 Question 3 (Page No. 333)
In early UNIX systems, executable files (a.out files) began with a very specific magic number, not one chosen at random. These files began with a header, followed by the text and data segments. Why do you think a ... chosen for executable files, whereas other file types had a more-or-less random magic number as the first word?

Lakshman Bhaiya asked in Operating System Oct 26, 2019

by Lakshman Bhaiya

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15

Andrew S. Tanenbaum (OS) Edition 4 Exercise 1 Question 36 (Page No. 84)
Examine and try to interpret the contents of a UNIX-like or Windows directory with a tool like the UNIX od program. (Hint: How you do this will depend upon what the OS allows. One trick that may work is ... with one operating system and then read the raw device data using a different operating system that allows such access.)

Lakshman Bhaiya asked in Operating System Oct 23, 2019

by Lakshman Bhaiya

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16

Andrew S. Tanenbaum (OS) Edition 4 Exercise 1 Question 29 (Page No. 83)
Figure $1-23$ shows that a number of UNIX system calls have no Win32 API equivalents. For each of the calls listed as having no Win32 equivalent, what are the consequences for a programmer of converting a UNIX program to run under Windows?

Lakshman Bhaiya asked in Operating System Oct 23, 2019

by Lakshman Bhaiya

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17

fork() system call

Sanjay Sharma asked in Operating System Jan 25, 2019

by Sanjay Sharma

380 views

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18

GATE Question
Where can I study the UNIX portion of OS? That is relavent for GATE.

Naruto Uzumaki asked in Operating System Jan 1, 2019

by Naruto Uzumaki

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2 answers

19

UGC NET CSE | July 2018 | Part 2 | Question: 55
Which UNIX/Linux command is used to make all files and sub-directions in the directory "progs" executable by all users? chmod - R a + x progs chmod - R 222 progs chmod - X a + x progs chmod - X 222 progs

Pooja Khatri asked in Operating System Jul 13, 2018

by Pooja Khatri

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20

Uttrakhand Asst. Professor Exam-48
Choose the incorrect statement Shell scripts can accept arguments Shell scripts are interpreted Shell is a programming language Shell scripts are compiled

gatecse asked in Unknown Category Mar 2, 2018

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1 answer

21

Uttrakhand Asst. Professor Exam-43
The command cat > x in unix is invalid creates a file x and displays an error message creates a file x and waits for the user to give input from the keyboard none of the above

gatecse asked in Unknown Category Mar 2, 2018

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22

I node
how 3 could be ans?

srestha asked in Operating System Jan 18, 2018

399 views

3 votes

1 answer

23

File System - Unix Inode

Anup patel asked in Operating System Oct 13, 2017

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1 answer

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UGC NET CSE | June 2008 | Part 2 | Question: 24
Files that are related to input/output and are used to model serial I/O devices such as terminals, printers and networks are called : (A) regular files (B) character special files (C) directories (D) block special files

rishu_darkshadow asked in Others Sep 27, 2017

by rishu_darkshadow

927 views

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2 answers

25

UGC NET CSE | December 2009 | Part 2 | Question: 40
The Unix command used to find out the number of characters in a file is (A) nc (B) wc (C) chcnt (D) lc

rishu_darkshadow asked in Operating System Sep 17, 2017

by rishu_darkshadow

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26

Doubt Regarding All terminologies Used in UNIX INODE
Explain the following terms with there respective formula (expression) 1) Max file size 2) Max possible file size 3) Max Disk Size 4) Total file size 5) max possible size of the file system. For max possible file size = https://gateoverflow ... . When to use what please clear this doubt.

Shubhanshu asked in Operating System Sep 6, 2017

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3 votes

1 answer

27

OS:- UNIX I node
Consider the organization of a UNIX file as represented by the inode Assume that there are 12 direct block pointers, and a singly, doubly, and triply indirect pointer in each inode. Further, assume that the system block size and the disk sector size are both ... file inode is already in main mem- ory, how many disk accesses are required to access the byte in position 13,423,956?

rahul sharma 5 asked in Operating System Aug 26, 2017

by rahul sharma 5

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2 votes

1 answer

28

can any one give detailed explanation of the question with answer ??
A user level process in Unix traps the signal sent on a Ctrl-C input, and has a signal handling routine that saves appropriate files before terminating the process. When a Ctrl-C input is given to this process ... routine executes? User mode Kernel mode Superuser mode Privileged mode Note : I know this is previous year question

hem chandra joshi asked in Operating System Aug 17, 2017

by hem chandra joshi

273 views

2 votes

2 answers

29

Operating System: UNIX Inode
Q1> Consider the Unix file node which maintains 12 direct disk block addresses, 1 single indirect, 1 double indirect, and 1 triple indirect disk block addresses. The disk block address requires 32 bits and DB size is 1 KB then calculate 1. ... byte no. 10000000 Byte in the file, location comprises of <In which direct/ indirect pointers branch the address is>

Shubhanshu asked in Operating System Aug 16, 2017

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5 votes

1 answer

30

ISRO2017-72
The Linux command mknod myfifo b 4 16 will create a character device if user is root will create a named pipe FIFO if user is root will create a block device if user is root None of these

sh!va asked in Operating System May 7, 2017

by sh!va

6.6k views

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Recent questions tagged unix