mac unix: Get name of terminal I am using through commands - macos

Question

I am looking for a terminal command that will open a new tab in the current terminal that I am using. For example, I run the command in iTerm 2 and a new tab opens in iTerm2 because that is the terminal that i am using.
I know how to open a tab by naming a static application like so:
osascript -e 'tell application "iTerm" to activate' \
-e 'tell application "System Events" to tell process "iTerm" to keystroke "t" using command down'
But of course this still opens iTerm if I am doing something like calling the command from mac's Terminal. I would love to do something like below, but I am unsure how to get the name of the terminal I am using.
currentTerminal = getCurrentTerminalApplicationName()
osascript -e 'tell application "&{currentTerminal}" to activate' \
-e 'tell application "System Events" to tell process "&{currentTerminal}" to keystroke "t" using command down'
I am also open to other ideas.

Answer 1

While inside macOS terminal:
env | grep TERM
TERM_PROGRAM=Apple_Terminal
While inside iTerm2:
env | grep TERM
TERM_PROGRAM=iTerm.app
UPDATE
You can always do something like this:
#!/bin/bash
if [ "$TERM_PROGRAM" == "iTerm.app" ]; then
echo "iTerm2"
cat <<EOF >/tmp/file.py
import iterm2
async def main(connection):
app = await iterm2.async_get_app(connection)
window = app.current_terminal_window
if window is not None:
await window.async_create_tab()
else:
print("No current window")
iterm2.run_until_complete(main)
EOF
$HOME/Library/Application\ Support/iTerm2/iterm2env-3.10/versions/3.10.4/bin/python /tmp/file.py
else
echo "not iTerm2"
fi
This code will open new tab inside iTerm2 - otherwise, it will do nothing.