Setting environment variables under Linux

SETENV (Set environment variable)

function Description: query or display environment variables.

syntax:setenv [variable name] [variable value]

Supplemental Instructions:setenv The instructions for querying or setting environment variables in Tsch.

For bash shells
About the environment variable command description:
1.echo displays an environment variable value echo $PATH
2.export setting a new environment variable export hello= "HELLO" (can be without quotation marks)
3.ENV Show All environment variables
4.set show locally defined shell variables
5.unset Clear environment variable unset HELLO
6.readonly set read-only environment variable readonly HELLO

Common environment variables
PATH: Determines to which directories the shell will look for commands or programs
Home: Current User home Directory
Mail: Refers to the current user's message store directory.
Shell: Refers to what kind of shell is used by the current user.
Histsize: Refers to the number of records in which history commands are saved
LOGNAME: Refers to the login name of the current user.
HOSTNAME: Refers to the name of the host, and many applications are usually obtained from this environment variable if they want to use the host name.
Lang/languge: is a language-related environment variable that users of multiple languages can modify.