Sometimes we do need to run programs in a terminal, can do like this:
xterm -e "sh -c './ttytter.txt -ansi -mentions -vcheck ; read"
The final "read" waits for you to press enter, to close the terminal.
You can use a different terminal program, and instead of "read" at the end you can run a shell, e.g.:
gnome-terminal -e "sh -c './ttytter.txt -ansi -mentions -vcheck ; exec bash'"
For some terminals (xterm) you might not need the sh -c '' wrapper; for some (gnome-terminal) we apparently do need that.
You can put such a command in .xinitrc, .xsession, or type it into a "run at startup" dialog.
You can also I think do this with a freedesktop .desktop file / shortcut, if you select "run in terminal", not sure how off the top of my head. That would be a much user friendly way to do it! See if you can figure that out...
Now, if you want to do it in general for any shell command, need to worry about shell escaping - and it becomes more difficult! Or, can put your command into a script and run the script.
It might also be helpful to see the command's exit status, like echo $? where 0 means success.
Sorry for over-complex answer, I hope it can help.