Linux
practice.

What is the output of second program if we run the demo1 first and after that we run demo2 in the different terminal?

/*This is demo1.c*/
#include<stdio.h>
#include<sys/ipc.h>
#include<sys/shm.h>
#include<string.h>
 
int main()
{
    int shm_id;
    char *addr;
    struct shmid_ds ds;
    shm_id = shmget((key_t)1234,10,0666|IPC_CREAT);
    if(shm_id == -1){
        perror("shmget");
    }
    addr = (char*)shmat(shm_id,NULL,SHM_RND);
    if(addr == (char *)-1){
        perror("shmat");
    }
    strcpy(addr,"Example");
    if (shmdt(addr) != 0){
        perror("shmdt");
    }
    sleep(10);      
    if( shmctl(shm_id,IPC_RMID,0) == -1){
        perror("shmctl");
    }
    return 0;
}
/*This is demo2.c*/
#include<stdio.h>
#include<sys/ipc.h>
#include<sys/shm.h>
 
int main()
{
    int shm_id;
    char *addr;
    struct shmid_ds ds;
    shm_id = shmget((key_t)1234,10,0666|IPC_CREAT);
    if(shm_id == -1){
        perror("shmget");
    }
    addr = (char*)shmat(shm_id,NULL,SHM_RND);
    if(addr == (char *)-1){
        perror("shmat");
    }
    printf("%s\n",addr);
    if (shmdt(addr) != 0){
        perror("shmdt");
    }
    return 0;
}

What is the output of this program?

#include<stdio.h>
#include<stdlib.h>
 
int main()
{
    int *ptr;
    ptr = (int *)calloc(1,sizeof(int));
    if (ptr != 0)
        printf("%d\n",*ptr);
    return 0;
}

If any sed command does not specify any address then the command is applied to

Which command will you use to see the available routes?

Which one shows the name of the operating system?

Which option of the kill command sends the given signal name to the specified process?

Proc filesystem provides the information about

The command "cd /proc/10/cwd" provides the

What is the output of this program?

#!/bin/sh
test_function1() {
    a=5
    echo "This is the first function"
    test_function2
}
test_function2() {
    echo "This is the second function" 
    test_function3
}
test_function3() {
    echo "This is the third function"
}
test_function1
exit 0

"ps" command uses the file . . . . . . . . to provide the information.

What is the output of this program?

#include<stdio.h>
#include<pthread.h>
#include<fcntl.h>
 
int fd;
void *fun_t(void *arg);
void *fun_t(void *arg)
{       
    char buff[10];
    int count;
    count = read(fd,buff,10);        
    printf("%d\n",count);
    pthread_exit("Bye");
}
int main()
{
    pthread_t pt;
    void *res_t;
    fd = open("demo.c",O_RDONLY);        
    if(pthread_create(&pt,NULL,fun_t,NULL) != 0)
        perror("pthread_create");
    if(pthread_join(pt,&res_t) != 0)
        perror("pthread_join");
    return 0;
}

In sysfs.h which one of the following structure represents the directory entries?

How do you get help about the command "cp"?

Which one of the following command can list the symbols defined in a library?

cat < file1 >> file2 | file3

While debugging with GDB, arguments to the program can be specified by the arguments of . . . . . . . . command.

What is the output of the following program?

x = 3; y = 5; z = 10;
if [( $x-eq3)-a($y -eq 5 -o  $z -eq 10 )]
then
    echo $x
else
    echo $y
fi

Which command identifies the resource of a command?

File descriptor table indexes which kernel structure?

Below is the code

int main() 
{
     int fd1, fd2;
     struct stat buff1, buff2;
     fd1 = open(“1.txt”, O_RDWR);
     fd2 = open(“2.txt”, O_RDWR | O_APPEND);
     lseek(fd1, 10000, SEEK_SET);
     write(fd1, “abcdefghij”, 10);
     write(fd2, “abcdefghij”, 10);
     fstat(fd1, &buff1);
     fstat(fd2, &buff2);
     printf(“ %d %d”, buff1.st_size, buff2.st_size);
     return 0;
}

Before running the program, the file 1.txt and 2.txt size is 20 each. What is the output?