Computer Science · all questions

Linux
practice.

Practice every MCQ with options. Use Show answers when you want the correct option and solution.

996

Questions

21/50

Page

Pick an option on a question to see the right answer and solution.

Q401

Which one of the following command saves the command history of GDB in a file?

Select an option to see the answer and solution.

Q402

When a target of makefile fails to execute

Select an option to see the answer and solution.

Q403

Which command sets the number for all lines?

Select an option to see the answer and solution.

Q404

Which of these commands will set the permissions on file textfile to read and write for the owner, read for the group, and nothing for everyone else?

Select an option to see the answer and solution.

Q405

Which one of the following is not true?

Select an option to see the answer and solution.

Q406

Which of the following commands will allow the user to search contents of a file for a particular pattern

Select an option to see the answer and solution.

Q407

Daemon process is a?

Select an option to see the answer and solution.

Q408

What is the output of this program?

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<sys/types.h>
#include<sys/ipc.h>
#include<sys/msg.h>
 
struct data_st{
    long int id;
    char buff[11];
};
int main()
{
    int m_id;
    struct data_st data1, data2;
    m_id = msgget((key_t)181,0666|IPC_CREAT);
    if(m_id == -1)
        perror("msgget");
    data1.id = 1;
    strcpy(data1.buff,"Example");
    if(msgsnd(m_id,&data1,11,0) == -1)
        perror("msgsnd");
    if(msgctl(m_id,IPC_RMID,0) != 0)
        perror("msgctl");
    if(msgrcv(m_id,&data2,11,1,0) == -1)
        perror("msgrcv");
    printf("%s\n",data2.buff);
    return 0;
}

Select an option to see the answer and solution.

Q409

Which of the following umask settings doesn't allow execute permission to be set by default on directory files

Select an option to see the answer and solution.

Q410

The directories of /sys directory

Select an option to see the answer and solution.

Q411

Which built-in function returns the arctangent of a/b in radians.

Select an option to see the answer and solution.

Q412

The command line options of gcc can also be read from a file with

Select an option to see the answer and solution.

Q413

The command "show commands" of GDB

Select an option to see the answer and solution.

Q414

shared memory can be used for?

Select an option to see the answer and solution.

Q415

What will print as the SIGINT signal hits the running process of this program?

#include<stdio.h>
#include<stdlib.h>
#include<signal.h>
 
void response (int);
void response (int sig_no)
{
    printf("%s",sys_siglist[sig_no]);
}
int main()
{
    signal(SIGINT,response);
    while(1){
        printf("Example\n");
        sleep(1);
    }
    return 0;
}

Select an option to see the answer and solution.

Q416

Which option of gcc inhibit all warning messages?

Select an option to see the answer and solution.

Q417

The command 'enable -n '

Select an option to see the answer and solution.

Q418

Which variable contains last background job process id

Select an option to see the answer and solution.

Q419

The file /proc version shows the version of . . . . . . . . used in the system.

Select an option to see the answer and solution.

Q420

Which among the following allows fast file system recovery?

Select an option to see the answer and solution.

Prev 19 20 21 22 23 Next