How can I stop or kill some application which is not responding.. without hurting other applications which are running... I mean like in windows Cntr+Alt+Del.. return all processes you select one and say end task..... like that...

Thanks

from a command line (like xterm or rxvt) type as follows:
'ps -A'

this will produce a long list of all the software running on your machine. on the left you will see a list of numbers labeled 'PID' or Process ID. you can then type

'kill <PID>' where <PID> is the process id of the app you want to stop. for more information on kill and ps read the man pages ... ie 'man kill' and 'man ps'.

hope that helps,
jpbarto

Or even, click the start button, run command and type xkill. Then click on the program you want to kill.

ps -A shows lots of file manes.... Most of them is strange to me(as a windows user). How to become familiar with some basic Linux applications names... functions... etc....
By the way, how can I know if file is executable one or not?(like com, exe, bat of Windows)

most of the process running you can quickly lookup on the web or you can bring up the system documentation for them ...
for example on mine I have a couple process running

349 xinit
227 agetty
542 sshd

etc...

to bring up more information about an app running you can usually type 'man <app-name>'. for example 'man sshd' will bring up information about the SSH server that is running.

as for executable that is determined by file permissions... not by file extension. if you execute 'ls -l' to get a detailed directory listing on the left of the files you will see a string of characters similiar to this:

rwxr-xr-x root users ... etc
This means that root is the owner of the file, users is the group of the file. As such the first three letters (rwx) mean that the owner has read, write, and execute permissions. The second group (r-x) means that members of the file's group have read and execute permissions and the third group (r-x) means that everyone has read and execute permissions. the 'x' or executable permission is what makes a file executable.

in a nutshell

jpbarto