Linux
practice.

What is the output of the program?

#! /usr/bin/awk -f
BEGIN {
   print toupper("eXaMpLe_1_$")
}

Which is not the correct option for removing a message queue

What is the output of this program?

#include<stdio.h>
#include<stdlib.h>
#include<string.h>                              
 
int main()
{
    char *ptr;
    ptr = (char*)malloc(sizeof(char)*8);
    strcpy(ptr,"example");
    printf("%d\n",*ptr);
    return 0;
}

The permission -rwSr–r– represented in octal expression will be

The command "awk {print $1} test.txt" will

What is the output of the following program?

b = 
[ -n $b ]
    echo $?
[ -z $b ]
    echo $?

Given the command

$ chmod o-w datafile

By default, a Linux user falls under which group?

Which GDB command is used to examine the memory?

What is the output of the command awk 'BEGIN {printf "%c\n",65}'

What is the output of this program?

#include<stdio.h>
#include<stdlib.h>
#include<fcntl.h>
 
int main()
{
    int fd;
    char *buff;
    buff = (char *)malloc(sizeof(char)*5);
    fd = open("example.txt",O_RDWR|O_CREAT); 
    write(fd,"Linux",5);
    read(fd,buff,5);
    printf("%s\n",buff);
}

Which is an example for block special file?

/proc/partitions contains

What is the output of this program?

#include<stdio.h>
#include<stdlib.h>
#include<string.h>                              
 
int main()
{
    int ptr;
    ptr = (int)malloc(sizeof(int)*10);
    return 0;
}

Which of the following commands can be used to copy files across systems?

What is the output of this program?

#include<stdio.h>
#include<fcntl.h>
 
int main()
{
     int fd, fd2, ret;
     fd = open("hello.c",O_RDONLY);
     ret = close(fd2);
     printf("%d\n",ret);
}

Which option is used by sed to specify that the following string is an instruction or set of instructions?

What is the output of this program?

#include<stdio.h>
#include<fcntl.h>
#include<sys/stat.h>
#include<semaphore.h>
 
int main()
{
    sem_t* sem_id;
    sem_id = sem_open("sem_value",O_CREAT,0666,0);
    if(sem_id == SEM_FAILED)
        perror("sem_open");
    sem_post(sem_id);
    printf("Example\n");
    if(sem_close(sem_id) == -1)
        perror("sem_close");
    return 0;
}

what is the output if the who command displays like this

who | cut –d ” ” -f1

The command "sed -n '/example/p' old.txt" will