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I have been given this program to modify.Can anyone please help me to explain the logic of the program.

I need to creat a program which tests all the functions implemented.

if the test program...

Yes quark,

I need to implement that and execute commands of the shell.

and the second part is to create your own commands

Can any1 please help me in CLI

I am having trouble in writing this program.

The program repeatedly accepts a "command line" from its standard input and executes it.

More than one command...