using sed and pstree to display the type of terminal being used

Question

I\'ve been trying to display the type of terminal being used as the name only. For instance if I was using konsole it would display konsole. So far I\'ve been using this command

Answer 1

You could use

ps -p "$PPID" -o comm=

Or

ps -p "$PPID" -o fname=

If your shell does not have PPID variable set you could get it with

ps -p "$(ps -p "$$" -o ppid= | sed 's|\s\+||')" -o fname=

Another theory is that the parent process of the current shell that doesn't belong to the same tty as the shell could actually be the one that produces the virtual terminal, so we could find it like this as well:

#!/bin/bash

shopt -s extglob

SHELLTTY=$(exec ps -p "$$" -o tty=)
P=$$

while read P < <(exec ps -p "$P" -o ppid=) && [[ $P == +([[:digit:]]) ]]; do
    if read T < <(exec ps -p "$P" -o tty=) && [[ $T != "$SHELLTTY" ]]; then
        ps -p "$P" -o comm=
        break
    fi
done