How to list the environment variables set for the current session (without including variable values ​​in this list)?

Question

linux

As I understand it, the list itself is issued by the env command, but it produces the form name = value, but how to display it without value, only name?

Answer 1

env|cut -d'=' -f1
Read more:
| - pipeline transfer
cut - output fields
-d'=' - set field separator
-f1 - output the first field (i.e. the one before the = sign)

Answer 2

env | awk -F"=" '{print $1}'