core-agent-linux/misc/qubes-run-terminal

#!/bin/sh
# Try to find a terminal emulator that's installed and run it.

for terminal in x-terminal-emulator gnome-terminal xfce4-terminal konsole urxvt rxvt termit terminator Eterm aterm roxterm termite lxterminal mate-terminal terminology st xterm; do
    # bogus warning from ShellCheck < 0.5.0
    # shellcheck disable=SC2039
    if type "$terminal" >/dev/null 2>&1 ; then
        exec "$terminal"
    fi
done

echo "ERROR: No suitable terminal found." >&2