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Hello everyone.
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What is External Commands?. An external command is an MS-DOS command not included in command.com . They are commonly external either because they require large requirements or are not commonly used commands. The illustration shows each of the external commands are separate files. However, the internal commands are included in the command.com file. They have an extension of .COM, .EXE etc. Some examples are assign , power , ping etc..
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Why are they needed?. They are powerful. Help fix Problems Improve Performance Keeping them in separate files help reducing load on the windows. Can be added to the Windows whenever needed by copying the file to computer..
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Functions : Operating system. Memory Management Processor Management Device Management File management Security Control over system performance Job accounting Error detecting aids Coordination between other softwa.
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Keeps track of primary memory. Decided which process gets the processor for how much time . Manages device communication via their respective drivers. Organizes files into dir directories for easy navigation. By means of password avoids unauthorized access Production of dumps, traces, error messages, and other debugging and error detecting aids. Used by various jobs and users to keep track of time and resources Coordinates assignment of compilers, interprets, assemblers and other software to the various users of the computer system..
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Credits PPT BY- Aditi Baranwal Explanation- Vaishnavi Khanna Ritu Maurya.
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Thank you.