working between 2-shells

tushar_pandey · 08-18-2012, 11:53 PM

i have opened a file using vi in 1st shell ,
now i want to kill it , using my another shell ..... How can i kill it .

Wim Sturkenboom · 08-19-2012, 12:17 AM

Code:

wim@aa0:/boot/grub$ ps -ef |grep vi
wim       2030  2016  0 07:20 pts/1    00:00:00 vi hallo.txt
wim       2032  1849  0 07:20 pts/0    00:00:00 grep vi
wim@aa0:/boot/grub$

will give you the pid of the vi process in the first numeric column; next use kill to kill it

towheedm · 08-19-2012, 12:25 AM

Do you mean shell or VT (virtual terminal)?

In any case, if you're logged in as the same user in the second VT, kill vi running in the first VT with:

Code:

kill $(pgrep vi)    # or,
pkill vi

Hope it helps.

tushar_pandey · 08-19-2012, 01:03 AM

see i have 2-accounts ! daa & daa_1

now i have created a file f_1 and use vi to view it , with the help of daa's command prompt , so vi process is un run state !

now i want to kill this process using daa_1's command prompt . how can i do this !

es0teric · 08-19-2012, 01:15 AM

You can kill any process by doing 'ps ax' to find the ID number of the process you want to kill. Once you know that number, just do 'kill #' (where # = PID). If the process doesn't wanna die, do "kill -9 #"

tushar_pandey · 08-19-2012, 01:24 AM

in my first_account

Code:

daa@daa-Aspire-5740:~/only_for_unix$ vi f_1 &
[4] 5778

in my second_account

Code:

daa_1@daa-Aspire-5740: kill -9 5778 
output is :: operation not permitted

unSpawn · 08-19-2012, 08:08 AM

From account daa_1 issue 'sudo -u daa kill -9 5778'. If that doesn't work then you need to configure Sudo to allow it, but more importantly please don't consider 'kill -9' as the convenient, default way to exit applications as it may leave temporary files when an editor is in edit mode or may deny an application to close its file descriptors properly.

Wim Sturkenboom · 08-19-2012, 08:14 AM

Of course you can't do it as another user; that would be a nice mess if anybody in a multi user system can kill the processes of other users. Totally defeats the security model.

The only user that can do this is root, so you need to be root (seeing that you're using ubuntu, sudo will do the trick).

In your case, as you know daa's password

Code:

daa_1@daa-Aspire-5740: su - daa

You will be prompted for daa's password after which you can kill daa's processes.

tushar_pandey · 08-19-2012, 08:35 AM

sorry , for wrong post !

Wim Sturkenboom · 08-19-2012, 10:53 AM

Nothing to be sorry about. You (and others) can learn from your question and the replies.

If it's solved, please mark it as such using the thread tools above the first post.

tushar_pandey · 08-19-2012, 10:57 AM

but i find , something from your post

Code:

that would be a nice mess if anybody in a multi user system can kill the processes of other users. Totally defeats the security model.

after it , i changed the mode of my file

Code:

chmod 777 file_name

vi file_name &

after it , i open my second account ! than

Code:

sudo kill -9 file_name

after it , i can delete the file easily !

Wim Sturkenboom · 08-19-2012, 11:06 AM

In that case you (as daa) give explicit permission to other users (e.g. daa1) to do anything with the file.

Also be aware that by using sudo, you basically elevate your privileges to those of a root user.

I've never never used kill to delete a file; will one day test it.

unSpawn · 08-19-2012, 11:56 AM

Quote:

Originally Posted by Wim Sturkenboom

Also be aware that by using sudo, you basically elevate your privileges to those of a root user.

...unless you explicitly "-u" another user.

Wim Sturkenboom · 08-19-2012, 01:48 PM

That's not the way it was used by OP and that's what I was referring to.