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Environment Variables - Shell Scripting

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Category: Shell Scripting Tutorials

All the environment variables will be declared in upper case and all local variables will be in lower case. This is the standard followed throughout the world.

HOME – will specify the home directory of the user

PATH – will specify the paths where it will search for commands

HOSTNAME – specifies the hostname of the server

SHELL – specifies the which shell is being used

PWD – specifies the current working directory

OLDPWD – specifies the previous working directory

Export Command:

export NEWENV=”success”

export is the command used to set an environmental variable

How to initialise environment variables during login?

Add the export command to .bash_profile or .profile file in your home directory. This file will be automatically executed during login, so the environment variables will be initialise when you login.

Printenv Command:

printenv | grep NEWENV

printenv is the command used to print all the environment variable.

 

 

 

 

 

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