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Shell -


The shell is a Command interpreter that interacts directly with the user. It takes commands from the user and carries them out, one at a time. As soon as the user logs onto the system, the shell becomes active. The shell provides the arrangement for the kernel to run a command. The shell thus forms a layer above the kernel and hides it from the user. It interacts with the kernel by passing commands and other information - arguments and parameters to the kernel. The kernel, in turn, loads programs and commands to run.

Following figure shows the importance of shell -
Diagram for shell

                The shell reads a command line from its standard input and interprets it according to a fixed set of rules. The standard input and standard output file descriptors for the login shell are usually the terminal on which the user logged in.

This post first appeared on BCA MCA NOTES, please read the originial post: here

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