You can check shell variables using the following methods:
1. Using echo
To display the value of a specific variable, use the echo command:
echo $MY_VARIABLE
2. Using printenv
To list all environment variables, you can use the printenv command:
printenv
To check a specific variable:
printenv MY_VARIABLE
3. Using env
You can also use the env command to display all environment variables:
env
4. Using set
To see all shell variables (including local variables), you can use the set command:
set
5. Using declare (for Bash)
In Bash, you can use the declare command to list all variables:
declare -p
To check a specific variable:
declare -p MY_VARIABLE
These commands will help you check the values and existence of shell variables in your current session.
