You have a space between ./ and clipgrab-3.4.2.x86_64. It should run if you type ./clipgrab-3.4.2.x86_64 with no spaces.

You can write whatever program/script you have to behave as a command. Let's say your executable script/program is named as my_script and is placed in /path/to/my_script.

Be sure that the script is executable. If not,then please do

chmod +x /path/to/my_script

Then, place a symlink to this location in /usr/local/bin as

sudo ln -s /path/to/my_script /usr/local/bin

You can add the symlink to any of the paths mentioned in $PATH.

That's it and enjoy your program.

You are looking for job control which is supported by most shells. See this article for an introduction. At some point you might also want to read the official documentation for bash which is the default shell in Ubuntu.

In short: To start a job automatically in the background put an & after the program call

$ program &

You can also stop programs with CTRLz and then put them into the background later with bg

$ program
^Z
$ bg

To get them to run in the foreground again use fg.

You can also add all the paths you have your programs in to your PATH environment variable.

Instructions for bash:

Just add to your .bashrc:

PATH=$PATH:/a/path/here:/another/path/here:/and/so/forth

replacing /a/path/here, /another/path/here, /and/so/forth with your paths. You can add as many paths as you like, but be aware to separate each of the paths with ':' and, don't add spaces between 'PATH' and the '=' sign.

You can also add

PATH=$PATH:.

so that you don't have to type ./program.sh, but only program.sh. Please, note that putting the dot ('.') in front of the path (PATH=$PATH:.) will prevent you running a program located in another directory if there is an executable file in your current working directory with the same name! So put the dot at the end of the PATH variable, so that if you run in this particular case, you can use the old ./program notation to tell apart which program you want to run.

Hope this helps.

PS: just another note: if you run a graphical program from a terminal emulator window, closing the window will automatically close the graphical interface. In order to avoid that just type myprogram & (append the ampersand sign '&' to the command you use to run your program). If you forget it, in the terminal window type CTRL+Z and just after that run the command bg.

You can write a .desktop file for your application. With terminal option the application should launch in terminal:

[Desktop Entry]
Type=Application
Name=Application Name
Exec=/path/to/nameofapp
Terminal=true

Alternatively, you can write a wrapper script that starts terminal and runs your application. For example (gnome-terminal):

#!/bin/sh
exec gnome-terminal -- ./nameofapp

It's possible that the current directory (".") isn't on your PATH. (You can check this by typing echo $PATH, this is a list of directories delimited with" :". "." should be in the list if you want to run something in the current directory.)

If the current directory isn't on your PATH, you'll need to type ./myprogram (or whatever the correct path is).