UNIX, get environment variable

Question

I have a ridiculous question due to a ridiculous problem.

Normally if I want to get the contents of an environment variable in UNIX shell, I can do

Answer 1

( set -o posix ; set ) | grep $var

search for all unix-compatible format variables been used

Answer 2

Do you mean something like this:

ENV() {
    printf 'echo $%s\n' $1 | sh
}

This works in plain old Bourne shell.

Answer 3

You can do:

printenv VARIABLE_NAME

Answer 4

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

Answer 5

How about this:

myVariable=$(env  | grep VARIABLE_NAME | grep -oe '[^=]*$');

Answer 6

The solution really depends on what the restrictions are why you can't use a simple $VAR. Maybe you could call a shell that doesn't have the restrictions and let this sub-shell evaluate the variable:

bash -c 'echo $VAR'