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The exact method of creating the alias depends on the shell environment you are using. For ksh, you could do the following: alias lt="ls -lt"
What exactly do you mean by a 'read operation'; the question is missing the semantics of what you want to accomplish.
tHE QUESTION WAS WHAT IS THE DIFFERENCE BETEEN unix and windows 7, but i did not get the appropriate answer.
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.
The question is too vague; converting what?
The question is too vague to answer..
The command is 'wall' (write all). In some systems it can only be executed by the administrator.
It can't be exactly the same name as root; directories in Unix have to be unique, and therefore you can't duplicate the name.
The question is rather vague; the applications used in Unix are similar or identical to those used in other operating systems, such as Windows.
If I understand your question....vague as it is....yes, the Unix OS source code is free and open source.
The question is too vague to answer clearly. There are too many versions of Linux and Unix and third party vendors.
A list of internal/builtin commands is available for each shell environment by looking at the 'man' entry. Anything not listed there is either an alias or an external command.