There are many different types of Unix Certification depending on what your career goals are. Check out Unix.org to find out information on the different certifications and for great test prep materials and tips.
In order to legally be called a "Unix" system, operating systems must undergo a rigorous and expensive certification procedure. "Unix-like" refers to systems that have an architecture similar to Unix, but have not undergone certification.
No, Unix certification is not required for all computer jobs, however it is useful to have some familiarity with Unix and all the different systems that computers run on. On top of that, you would also want to have a specialty in order to make more money.
One can read the book The Art of UNIX Programming by Eric S. Raymond. A person can also find tutorials at many locations on the internet, including right on the official UNIX website, eHow, and more.
Information on the UNIX file system can be found in some magazines dedicated to technology such as Science Illustrated. Information can also be found on UNIX's official website.
"gettimeofday" is a command used in Linux and Unix, thus not capitalized. If one wishes to find information on it, the person should look for a manual or a list of Linux/Unix commands with definitions.
Yes, there are several online courses you can take to gain different types of certification in UNIX. However, it generally appears that experience is more helpful than a certificate, so you might be better off reading books on your own and trying out coding.
All Unix systems provide a 'find' command that searches for specific files in a given directory. To find a file that has the word "foo" in the /usr directory, I would type: $ find /usr -name *foo* For more information, see 'man 1 find'.
Fuser is a Unix command and requires some technical knowledge to fully understand. Information on Fuser is available from Wikipedia, The Geek Stuff or may be found in specialist magazines relating to Unix.
Depends on what you mean by a "gnu" file, since utilities are common across Unix platforms including HPUX. Need more information.
The not-for-profit Open Systems Foundation was created in 1988 to attempt an open standard for Unix. See related link for more information.
Unix files do not rely on extensions, therefore there is no command to find them.
There are some places in order for one to look for website hosting for Unix. However, it is strongly suggested that one should check out the main website of HostSearch.