Linux
practice.

What command is used to copy files and directories?

Which expression use the value of the enclosed arithmetic expression?

To read/write attribute, which one of the following method is required?

What is the output of the program?

#include<stdio.h>
#include<sys/types.h>
#include<sys/un.h>
#include<sys/socket.h>
 
int main()
{
    struct sockaddr_un add_server, add_client;
    int fd_server, fd_client;
    int len;
    char ch;
    fd_server = socket(AF_UNIX,SOCK_STREAM,0);
    if(fd_server == -1)
        perror("socket");
    add_server.sun_family = AF_UNIX;
    strcpy(add_server.sun_path,"demo_sock");
    if( bind(fd_server,(struct sockaddr*)&add_server,sizeof(add_server)) != 0)
        perror("bind");
    if( listen(fd_server,3) != 0)
        perror("listen");
    len = sizeof(add_client);
    fd_client = accept(fd_server,(struct sockaddr*)&add_client,&len);
    printf("Example\n"); 
    return 0;
}

Runlevel system command is used for?

Which option of the command 'cd' use the actual filesystem path for cd.. and the value of pwd?

cmd > abc 2>&1 will

Which command sets up shorthand for command or command line?

If a signal is received by a process, when will it be processed?

Solaris real time class priority is

What is the output of this program?

#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,IPC_RMID,myun);
    semctl(sem_id,0,SETVAL,myun);
    sem_p();
    printf("Example\n");
    sem_v();
    return 0;
}

In sysfs every subsystem has

In the shell, by default, all variables are considered and stored as

In GDB, a tracepoint can be set by the command

The permission -rwxr-sr– represented in octal expression will be

Switch table is used by

Which daemon manages the physical memory by moving process from physical memory to swap space when more physical memory is needed.

Which gcc option includes debugging info in the generated object code?

Which option of gcc makes the compiler print out each function name as it is compiled, and print some statistics about each pass when it finishes?

If a file is removed in Unix using 'rm' then