system programming

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please answer these questions:

6. Which of the following commands would you use to start Python from the command prompt? a) c) python run python b) d) ./python go python Answer the following questions related to Unix Shell commands. a) Write a command to find all directories that start with tmp and remove execute permissions from group and others. b) Redirect both standard output and standard error of command ls -R to a file /tmp/txt. c) How does SHELL determine the command to run when user invokes a command without the full path