Unix Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Unix Interview Questions

Questions Answers Views Company eMail

Why do I get connection refused when the server is not running?

1 2452

How can I set the timeout for the connect() system call?

1541

Why does connect() succeed even before my server did an accept()?

1 2189

How do I convert a string into an internet address?

1424

What are socket exceptions? What is out-of-band data?

1 2337

Why do I keep getting EINTR from the socket calls?

1 2163

Is there any advantage to handling the signal, rather than just ignoring it and checking for the EPIPE error? Are there any useful parameters passed to the signal catching function?

1483

How do I send [this] over a socket?

1 2300

How come select says there is data, but read returns zero?

1 2115

How can I force a socket to send the data in its buffer?

1664

What are the pros/cons of select(), non-blocking I/O and SIGIO?

1405

Why does it take so long to detect that the peer died?

1556

Why do I get EPROTO from read()?

1492

Where can a get a library for programming sockets?

1 2191

Whats the difference between select() and poll()?

1704

Un-Answered Questions { Unix }

What is the core of unix operating system?

970

Does windows use unix?

994

Is ‘du’ a command? If so, what is its use?

1202

How to perform a system shutdown in unix?

999

Differentiate between paging and swapping?

950

Is tcp or unix socket faster?

892

When i run a programm of orphan process. Instead of getting child's parent (ppid)=1 ..i get 1400 and it varies as per system. How can i findthe right soluion??? My pgm: #include # include int main() { int pid; pid=fork(); if(pid < 0) {exit(-1);} else if(pid==0) { printf("Child Process is Sleeping ..."); sleep(10); printf("Orphan Child's Parent ID : %u ",getppid()); } else { printf("Parent Process Completed ... %u ",getpid()); exit(0); } return 0; } Output:

2313

How do you kill a job in unix?

1092

Give a brief idea about representation of devices in unix.

1030

What is unix in simple terms?

962

What is difference between find and grep in unix?

1008

What is necessary before running a shell script from the terminal?

1011

Which command is used to find whether the system is 32 bit or 64 bit?

1194

Which unix command to make a new directory?

1189

Is unix an operating system?

933

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