I think you mean the regular expression tool "grep".
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Yes, him and three other students at MIT use to hack Unix systems alot.One of those Unix Hacks ended up being MSDOS
Traditional file processing systems include manual systems and also computer based file systems that were linked to particular application programs. This is the type of file processing that you used with your 3GL programming. They share a number of characteristics.
I know nothing about Unix but for windows there is the control+alt+deleat combination ants there is also the flag or windows key.
Most often referred to as a 'script' in most operating systems; the method for triggering the said script will differ. Windows based would be a 'Scheduled Task' or a 'Service' if it continually runs, or Unix based systems a 'cron job' if it is a secheduled or time based task, or you could utilise iWatch (for example) to trigger a script when the contents of a file or folder changes.
There are two major types: Windows and operating systems that derived from Unix. OS X is Unix-like because it's based on Darwin which is BSD, another Unix-like operating system family, which are cousins to Linux (which itself has over 300 variants)