Linux
practice.

What is the output of this program?

#include<stdio.h>
#include<pthread.h>
#include<semaphore.h>
 
void *fun_t(void *arg);
void *fun_t(void *arg)
{
    sem_post(&st);
    pthread_exit("Bye");
}
int main()
{
    pthread_t pt;
    sem_t st;
    void *res_t;        
    if(pthread_create(&pt,NULL,fun_t,NULL) == -1)
        perror("pthread_create");
    if(sem_init(&st,0,0) != 0)
        perror("sem_init");
    if(sem_wait(&st) != 0)
        perror("sem_wait");
    printf("Example\n");
    if(pthread_join(pt,&res_t) == -1)
        perror("pthread_join");
    if(sem_destroy(&st) != 0)
        perror("sem_destroy");
    return 0;
}

Sysfs represents the

In awk, the built-in variable FS is

What is the output of this program?

#!/bin/bash
a=10
b=$(($a<0&&$a<100 ))
echo $b
exit 0

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,ret;
    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");
    ret = msgsnd(m_id,&data1,11,0);
    printf("%d\n",ret);
    if(msgrcv(m_id,&data2,11,1,0) == -1)
        perror("msgrcv");
    if(msgctl(m_id,IPC_RMID,0) != 0)
        perror("msgctl");
    return 0;
}

What is the output of this program?

#include<stdio.h>
#include<pthread.h>
 
void *fun_t(void *arg);
void *fun_t(void *arg)
{
    sleep(1);
}
int main()
{
    pthread_t pt;
    void *res_t;
    if(pthread_create(&pt,NULL,fun_t,NULL) != 0)
        perror("pthread_create");
    if(pthread_join(pt,&res_t) != 0)
        perror("pthread_join");
    printf("%s\n",res_t);
     return 0;
}

If user tries to remove (rm) a readonly file (444 permission), what will happen?

The user can define a command for GDB with the command

On Linux, initrd is a file

Which one of the following is not a valid makefile directive?

Which command is used to delete the character before the cursor location in vi editor?

In sysfs, each represented bus type has two directories named as

Which of the following files need to be referred for user's secondary group?

What is job number?

What is the output of this program?

#include<stdio.h>
#include<fcntl.h>
 
int main()
{
    int fd, count;
    fd = open("demo.txt",O_WRONLY|O_CREAT);
    count = write(fd,"Linux System Programming",5);
    if(count != 5)
        perror("write");
    return 0;
}

When a device is removed from the system

The following commands gives the output like this

#cat file1 file2
#cat: file1: No such file or directory

If we execute the command “cat file1 file2 1>2 2>&1” the output would be

Which among the following interacts directly with system hardware?

Which one of the following is not a platform specific code?

Which one of the following directory contains every physical device that has been discovered by the bus types registered with the kernel?