Linux MCQ Questions & Answers | Computer Science Page-9 section-4

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81.

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;
}

A. 0

B. 1

C. 2

D. 3

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82.
If one of the thread in multithreaded process is blocked on an I/O, which of the following is true?

A. The entire process with block if their is no kernel supported threads

B. Other threads of the process will continue to execute even if there is no kernel supported threads

C. It depends on specific implementatation

D. All of the mentioned

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83.
Ctrl-Z key combination

A. generates a SIGINT signal

B. stops the process running in the shell

C. kills the process running in the shell

D. generates a SIGINT signal & kills the process running in the shell

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84.

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;
}

A. end

B. beginning

C. second line

D. third line

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85.

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

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

A. 0

B. 1

C. 2

D. 3

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86.

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;
}

A. 10

B. 0

C. -1

D. none of the mentioned

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87.

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

A. 'Example' will print 4 times

B. 'Example' will print 3 times

C. 'Example' will print 5 times

D. Example will generate an error message

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88.
Which of the following commands allows definition and assignment of environment variables under bash

A. env

B. export

C. environ

D. setenviron

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89.
The directory /proc/[PID]/tasks contains

A. hard links to any task that have been started by this process

B. files that containing tasks that have been started by this process

C. sub-direcories of various tasks

D. none of the mentioned

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90.

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;
}

A. this program will print the garbage of 512 bytes

B. this program will print nothing

C. segmentation fault

D. none of the mentioned

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81.
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; }`

Answer & Solution

82.
If one of the thread in multithreaded process is blocked on an I/O, which of the following is true?

Answer & Solution

83.
Ctrl-Z key combination

Answer & Solution

84.
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; }`

Answer & Solution

85.
What is the return value ($?) of this code:

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

Answer & Solution

Answer & Solution

87.
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`

Answer & Solution

88.
Which of the following commands allows definition and assignment of environment variables under bash

Answer & Solution

89.
The directory /proc/[PID]/tasks contains

Answer & Solution

90.
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; }`

Answer & Solution

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Linux MCQ Questions & Answers | Computer Science

81. 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; }

Answer & Solution

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

Answer & Solution

83. Ctrl-Z key combination

Answer & Solution

84. 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; }

Answer & Solution

85. What is the return value ($?) of this code: os = Unix [$osName = UnixName] && exit 2 [${os}Name = UnixName] && exit 3

Answer & Solution

Answer & Solution

87. 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

Answer & Solution

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

Answer & Solution

89. The directory /proc/[PID]/tasks contains

Answer & Solution

90. 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; }

Answer & Solution

Read More Section(Linux)

81.
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; }`

82.
If one of the thread in multithreaded process is blocked on an I/O, which of the following is true?

83.
Ctrl-Z key combination

84.
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; }`

85.
What is the return value ($?) of this code:

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

87.
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`

88.
Which of the following commands allows definition and assignment of environment variables under bash

89.
The directory /proc/[PID]/tasks contains

90.
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; }`