I/O Redirection is used when you don't want the output to go to the standard output location, e.g., the screen. It can be very helpful in capturing information to be used in a later process.
For example, if the command 'ls' is used the output goes to the screen.
But if the command 'ls > ls.out' is used, then the ls command output will be redirected to a file called ls.out, which can be examined, edited, or used in a later process.
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Your question isn't really that clear; you can create a new file when exiting any of the editor programs, by using I/O redirection, or the touch command.
It is a spell checker; you get the advantage of checking your spelling.
Linux, Minix, Coherent, FreeBSD, etc. These are all clones of Unix
Solaris, Mac OS X, HP-UX, and IRIX are all examples of Unix systems.
There are many example ,starting from UNIX to Windows 8
For example struct tm and struct stat are often used by UNIX processes.
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Windows, Linux, Unix.
One of the major advantages of unix based hosting is that unix is free, so the cost is not an issue. Another cost benefit is that several free applications are available for Unix based servers so the money that would have been allotted to this could be utilized elsewhere. Unix is also very efficient because less system resources are required which means less bandwidth and RAM are used. This results in a smoother and faster site. Many languages were developed using Unix as well. This means that there are more applications will be able to run on your site than if you had chosen another platform.
It is a system software and all the processes in the operating system can be controlled by the user.
To write programs in it. A prominent example is UNIX.