How to start an app by a terminal and to keep it running, when closing the terminal?

[Ralf Mardorf]

On Wed, 2014-05-21 at 03:36 +0000, staticsafe wrote:
> screen/tmux is probably the most reliable soloution to this particular
> problem.

Before I posted my request I already read about screen and tmux, but I
didn't read detailed and perhaps got a wrong impression.

On Wed, 2014-05-21 at 14:49 +1200, Richard Hector wrote:
> PS what makes this OT?

It's my attitude regarding to this issue. It's not important for me, I
just want to learn a little bit, without taking a hard learning curve.
It's about writing scripts for an unimportant task.
It's about writing scripts in a freakish style, similar to spaghetti
code.

I feel free to send a request to Debian user about script writing,
assumed I've got a serious question, for an important task and I'm
willing to take a hard learning curve.

Thank you all for your suggestions, I will continue at the weekend.
Btw., yes, the grep thingy is finding the ps result.

Terminal 1:
$ evowrap --force-shutdown
Launch: evolution --force-shutdown
Cancel? [c]

Terminal 2:
$ while ps aux | grep "evowrap --force-shutdown" | grep -v grep ; do sleep 1 ; done; echo ";)"
rocketm+  2639  0.0  0.0  15772  1660 pts/0    S+   13:22   0:00 /bin/sh /usr/local/bin/evowrap --force-shutdown
rocketm+  2639  0.0  0.0  15772  1660 pts/0    S+   13:22   0:00 /bin/sh /usr/local/bin/evowrap --force-shutdown
rocketm+  2639  0.0  0.0  15772  1660 pts/0    S+   13:22   0:00 /bin/sh /usr/local/bin/evowrap --force-shutdown
rocketm+  2639  0.0  0.0  15772  1660 pts/0    S+   13:22   0:00 /bin/sh /usr/local/bin/evowrap --force-shutdown
rocketm+  2639  0.0  0.0  15772  1660 pts/0    S+   13:22   0:00 /bin/sh /usr/local/bin/evowrap --force-shutdown
rocketm+  2639  0.0  0.0  15772  1660 pts/0    S+   13:22   0:00 /bin/sh /usr/local/bin/evowrap --force-shutdown
rocketm+  2639  0.0  0.0  15772  1660 pts/0    S+   13:22   0:00 /bin/sh /usr/local/bin/evowrap --force-shutdown
rocketm+  2639  0.0  0.0  15772  1660 pts/0    S+   13:22   0:00 /bin/sh /usr/local/bin/evowrap --force-shutdown
;)

The ";)" appears after ...

Terminal 1:
$ evowrap --force-shutdown
Launch: evolution --force-shutdown
Cancel? [c] c
$

... I entered "c"ancel. Without finishing the script running in terminal
emulation 1, I only get the output of the while-grep-loop. To get the
output of echo, I need to terminate the script running in terminal
emulation 1.

Regards,
Ralf