Customized Shell command line interface written in Python and C

1. In terminal, navigate to project folder, input python3 shell.py to start shell.
2. Type in any shell commands after the prompt to test the program.

1. Compile shell.c, a file named a.out will be produced
2. chmod -x a.out to give the file permission to execute
3. ./a.out to run C shell
4. Test any shell commands

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