Question: system programming please need clear answer: 1- Write a command to find all directories that start with tmp and remove execute permissions from group and

system programming please need clear answer:

1- Write a command to find all directories that start with tmp and remove execute permissions from group and others.

2- Redirect both standard output and standard error of command ls -R to a file /tmp/txt.

3- How does SHELL determine the command to run when user invokes a command without the full path?

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