Question: Shell script 1. What are other (4) shell environment variables that are not $HOME, $PATH, $IFS, $PS1, $SHELL.And what do they do? 2. What are

Shell script

1. What are other (4) shell environment variables that are not $HOME, $PATH, $IFS, $PS1, $SHELL.And what do they do? 
 
2. What are the processes with process IDs 1, 2, and 3 on LINUX/UNIX system? What is the command to find these three processes? what do they do?

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