How to check if the current shell is where I logged in?
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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)
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.