1/14/15 Notes

Question 1

everything starts with init, what starts that process

Answer 1

the kernel

Question 2

What does every process have?

Answer 2

A parent, some have children and some dont

Question 3

What does a kill on a parent do the the child processes

Answer 3

it kills the child process

Question 4

How doe the shell locate executables ?

Answer 4

it uses the PATH

Question 5

How does inheritance occur?

Answer 5

Inheritance occurs when a new shell is created. But inheritance only happens at the point of creation. A new environment variable in the parent does NOT automatically get passed down to the children.

Question 6

What does the command env do?

Answer 6

gives you a list of environment variables

Question 7

What are variables?

Answer 7

a name in a program that has values. The variable can be used and executed in scripts.

Question 8

When referring to a variable what symbol do you use?

Answer 8

$

Question 9

Does the process init have a parent process?

Answer 9

No it is god, that is awoken by the kernel

Question 10

What does the command pstree do?

Answer 10

it gives you a tree of running process and shows the relations ships between them, aka parent to child

Question 11

Where to local variables get saved?

Answer 11

They only get saved in the local shell

Question 12

Putting a program variable in the startup file make it what?

Answer 12

A permanent variable, and will be passed down to any shell created

Question 13

what command would you use to force a variable on to child process ?

Answer 13

export

Question 14

what command takes off the environment variable

Answer 14

unset