Commands:
export: Set environment variables.
env: View environment variables.
echo: Display environment variables.
Common Environment Variables:
PATH: Directories where the shell looks for executable files.
HOME: User's home directory.
USER: Current logged-in user.
Setting Environment Variables:
export VARIABLE_NAME=value
Example:
export MY_VAR="Hello World"
Viewing Environment Variables:
env
Displaying Environment Variables:
echo $VARIABLE_NAME
Pratice
echo 'export FOO="bar"' > envscript.sh
echo 'echo $FOO' >> envscript.sh
chmod +x envscript.sh
./envscript.sh
# Do in one line
export USER_NAME="Alice"; echo $USER_NAME