Linux
practice.

What is the output of this program?

#include<stdio.h>
#include<sys/types.h>
#include<sys/socket.h>
 
int main()
{
    int fd;
    fd = socket(AF_UNIX,SOCK_STREAM,0);
    printf("%d\n",fd);
    return 0;
}

If one of the thread in multithreaded process is blocked on an I/O, which of the following is true?

Ctrl-Z key combination

In the output of this program, the string "/* Linux */" will be added at the . . . . . . . . of the source file.

#include<stdio.h>
#include<stdlib.h>
#include<fcntl.h>
 
int main()
{
    int fd;
    fd = open("test.c",O_RDWR|O_APPEND);
    write(fd,"/* Linux */",11);
    return 0;
}

What is the return value ($?) of this code:

os = Unix
[$osName = UnixName] && exit 2
[${os}Name = UnixName] && exit 3

What is the output of this program?

#include<stdio.h>
#include<pthread.h>
 
void *fun_t(void *arg);
void *fun_t(void *arg)
{       
    printf("%d\n",a);
    pthread_exit("Bye");
}
int main()
{
    int a;  
    pthread_t pt;
    void *res_t;         
    a = 10;
    if(pthread_create(&pt,NULL,fun_t,NULL) != 0)
        perror("pthread_create");
    if(pthread_join(pt,&res_t) != 0)
        perror("pthread_join");
    return 0;
}

After running this program, as your press 4, what will be the output of the program?

#!/bin/bash
echo "How many times you want to print 'Example'"
read value
for ((i=0;i<$value;i++))
do
echo "Example";
done
exit 0

Which of the following commands allows definition and assignment of environment variables under bash

The directory /proc/[PID]/tasks contains

What is the output of this program?

#include<stdio.h>
#include<fcntl.h>
 
int main()
{
    int fd;
    char buff[512];
    if( mkfifo("/tmp/test_fifo",0666) == -1)
        perror("mkfifo");       
    fd = open("/tmp/test_fifo",O_RDONLY);
    read(fd,buff,512);
    printf("%s\n",buff);
    return 0;
}

Which is an example for character special file?

Which one of the following statement is not true?

Which command searches the string in file opened in vi editor?

What is the output of this program?

#! /usr/bin/awk -f
BEGIN {
    print "20"<"9" ? "true":"false"	      
}

What is the output of the program?

#! /usr/bin/awk -f
#This filename is text.awk
BEGIN {
    print FILENAME
}

The file /proc/cpuinfo is a collection of

Which command is used to mount file system read only.

Which one of the following in true about this program?

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

If a file with execute permissions set, but with unknown file format is executed

If we use a driver for various device files, then