Which of the following utilities is used to search out regular expressions in the input?

What does the command 'mknod temp p' do?

Threads created via pthread_create need to first set up shared memory using shmop before they can share data.

What does the 'open' system call return to the caller?

Effect of a process executing an unlink system call while another process has opened the same file?

Which signal cannot be ignored by a process?

Recently your office's UNIX tool-chain was updated. Now, code that previously used to build and run still builds without any warnings or errors but displays load-time errors due to symbols not found in shlibs. You have ensured that all necessary shared libraries are present in the path 'pointed to' by the appropriate environment variable. Which is true?

It is not possible to set the sticky bit of a file when creating it. Therefore it is necessary to create the directory and then set the sticky bit by executing: mkdir(“/tmp/dir”, 0744); chmod(“/tmp/dir”, 07744). Why?

In a Unix toolchain, which one of these pairs does not fit with the others?

What does this code do: [aLock lockWhenCondition:(int)self beforeDate:[NSDate dateWithTimeIntervalSinceNow:maxTimeInterval]];

Which of the following could the fork() command return to the parent process?