What activities are done by shell in UNIX system?

The following activities are typically performed by the shell----
It issues the prompt and sleeps till user enter a command.
After a command has been entered, the shell scans the command line for specialcharacter that has special meaning for it.
It then creates a simplified command line and passes it on to thekernel for execution.
The shell cannot do any work while the command is being executed and has to wait for its completion.
After the job is complete, the prompt reappears and the shell return to sleeping.