Linux
practice.

Which tar command option is used to list the files in a tape archive format?

A . . . . . . . . is a higher level view of a device that abstracts out low level implementation details/

In vi editor, the key combination CTRL+f

What is the output of this program?

#include<stdio.h>
#inlcude<stdlib.h>
 
int main()
{
    int *ptr;
    double *ptr;
    printf("%d\n",sizeof(ptr));
    return 0;	   
}

The signal sent to a process when the Ctrl-C key is pressed is

BASH shell stands for?

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(msgrcv(m_id,&data2,11,0) == -1)
        perror("msgrcv");
    printf("%s\n",data2.buff);
    if(msgctl(m_id,IPC_RMID,0) != 0)
        perror("msgctl");
    return 0;
}

What is the output of this progarm?

#include<stdio.h>
#include<unistd.h>
 
int main()
{
    execl("/bin/ls","ls",NULL);
    return 0;
}

GDB can be used for

In which condition this program will print the string "Example"?

#include<stdio.h>
#include<stdlib.h>
 
int main()
{
    int *ptr;
    ptr = (int *)malloc(sizeof(int)*10);
    if (ptr == NULL)
        printf("Example\n");
    return 0;
}

Which one of the following is not true about GDB?

In Linux kernel-2.6 Real time priority ranges from

What is the function of bind command in bash shell?

If the argument is supplied to the exit statement,

Which signal is generated when we press control-C?

How do you get parent process identification number?

printf() uses which system call

Sysfs was originally called

Which command can be used to test various file attributes

What is the output of this pogram?

#include<stdio.h>
#include<stdlib.h>
#include<sys/types.h>
#include<sys/ipc.h>
#include<sys/sem.h>
 
static int sem_p(void);
static int sem_v(void);
union semun{
    int val;
    struct semid_ds *buf;
    unsigned short array;
};
int sem_id;
struct semid_ds myds;
struct sembuf mybuf;
union semun myun;
static int sem_p(void)
{
    mybuf.sem_num = 0;
    mybuf.sem_op = -1;
    mybuf.sem_flg = SEM_UNDO;
    semop(sem_id,&mybuf,1);
}
static int sem_v(void)
{
    mybuf.sem_num = 0;
    mybuf.sem_op = 1;
    mybuf.sem_flg = SEM_UNDO;
    semop(sem_id,&mybuf,1);
}
int main()
{
    int wfd, rfd;
    sem_id = semget((key_t)911,1,0666 | IPC_CREAT);
    myun.val = 0;
    semctl(sem_id,0,SETVAL,myun);
    sem_p();
    printf("Example\n");
    sem_v();
    semctl(sem_id,0,IPC_RMID,myun);
    return 0;
}