Description: shell procedures call for the support of the following internal shell commands : 1. Batch Processing If the shell startup with a file name as a parameter. Open the document and implement all the documents in order. When all the whole process from the end of the shell. 2. Debugging for-v option, shell activated this option will open in the course of operation a number of debugging output information. In the model, the shell should show all of the process of creating the PID, Bulletins have been the end of the process and the sub-transmission to the child process parameters. 3. Prompt (command line prompt) Print $ explanation for PS2 as a prompt. 4. Background Processing order to meet if
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