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There are many editors available in Unix, and they all have different methods of exiting out. You need to specify exactly which editor you are concerned with.
Most UNIX implementations use the same type of addressing as other modern Operating Systems, which include page translation, segmentation, and virtual memory addressing.
The function egrep in Unix allows the Linux user to specify a pattern match using a regular pattern expression in the search. The feature is used to find content within files that match a certain criteria.
The host file in Unix is usually located in the /etc directory.
The primary function of Unix is the same as it would be for an Operating System - to manage resources and provide security.
Unix can host different database systems, so it depends on which database you are referring to. A dba will do the same types of things in Unix as you would in any other operating system.
Probably thousands of programs have never been ported to Unix. It would be impossible to make a comprehensive list.
Unix can be used on a large number of mainframes, servers, and workstations. If you would like to use a certified UNIX system on commodity hardware, Solaris 10 can be downloaded free of charge for non-commercial use.
It would take a very long time to learn all of the Unix commands, and frankly, that isn't necessary. Most Unix users have a subset of commands they use all the time, and that is how they learn them.
The inherent problem in ing your question is that there is no single operating system known as "Unix." Unix is a specification for a large number of operating systems to meet and comply with. The installation for Solaris is different from that of AIX, which is different from that of TRU64. In order to receive a definitive , you would need to define which Unix you are trying to install.
rmdir
That would be IRIX.