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Answer Posted / subbareddy
Each process in Unix has its own set of environment
variables. They're called environment variables because the
default set of such variables consists mostly of session-
wide variables used for configuration purposes.
From the point of a Unix shell though, environment
variables can be accessed the same way as any other
variable.
Common environment variables in Unix
Most well known environment variables are the following:
USER - username of a Unix user
HOME - full path to a user's home directory
TERM - terminal or terminal emulator used by a current user
PATH - list of directories searched for executable files
when you type a command in Unix shell
PWD - current directory
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