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Old 02-13-2008, 08:55 AM   #1
anupamsr
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[solved] How to check if the current shell is where I logged in?


Hi!

Is there a way to check if the current shell is the one where I logged in? (I mean, gave my username and password?)

Last edited by anupamsr; 02-13-2008 at 01:13 PM. Reason: solved
 
Old 02-13-2008, 09:57 AM   #2
Dinithion
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To get the PID of you running bash:
echo $$

Check if the current bash is loginshell:
ps aux | grep $$

If there is a dash in front of bash, its a loginshell, i.e:
xxx 11740 0.1 0.0 3800 2060 tty2 Ss 15:52 0:00 -bash (This is a loginshell)
xxx 11776 0.0 0.0 3516 1928 tty2 S 15:53 0:00 bash (This is childbash of a loginshell
xxx 11827 0.0 0.0 3496 1880 pts/1 Ss 15:54 0:00 bash (This is a VT in X)
 
Old 02-13-2008, 12:01 PM   #3
anupamsr
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Yes but that also lists the grep command!
 
Old 02-13-2008, 12:02 PM   #4
anupamsr
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Never mind!

ps x|grep $$|grep -v grep
 
Old 02-13-2008, 01:12 PM   #5
anupamsr
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Here, this does the trick:
Code:
if [ `ps o pid,args|grep -ce '^ *'$$' *-bash\( .*\)\?$'` -gt 0 ]; then
    echo login shell
fi
Adding this to .bashrc, now I can switch to zsh except when I want to run bash specifically.

There is still a problem, because many terminal emulators start with login shell. That I don't know how to handle, except by disabling this "feature".

And thanks a lot Dinithion!

Last edited by anupamsr; 02-13-2008 at 01:14 PM.
 
Old 02-13-2008, 02:37 PM   #6
Dinithion
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A login shell (Where you enter username/password) is assigned a tty device. As you can see in my other post, the one at the bottom is a VT, and is assigned to pts/1, while the other two belongs to tty2. So you could always filter them out by adding tty to ps options.
 
Old 02-13-2008, 03:20 PM   #7
anupamsr
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Yes, but then the solution will not work if I ssh to another computer because then login shell is assigned a pts.

Since I am using rxvt-unicode, and starting the X server using startx from console, the current solution works nicely.

Last edited by anupamsr; 02-13-2008 at 03:22 PM.
 
Old 02-13-2008, 04:15 PM   #8
Dinithion
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Oh yeah. I didn't think of that. As long as it works, its good
 
  


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