UNIX, get environment variable
Solution 1:
You can do:
printenv VARIABLE_NAME
Solution 2:
type the following command in terminal, it will display all the list of environment variables
printenv
now print the wanted variable like this:
echo $VARIABLENAME
Solution 3:
Using ${!VAR_NAME} should be what you are looking for
> FOO=BAR123
> VAR_NAME=FOO
> echo ${VAR_NAME}
FOO
> echo ${!VAR_NAME}
BAR123
Solution 4:
Do you mean something like this:
ENV() {
printf 'echo $%s\n' $1 | sh
}
This works in plain old Bourne shell.