Where am I booting from?

[Buckiller]

What are some command line commands I can use to figure out from which device I am currently booting from/logged in to/manipulating?

For example, I have the exact same linux on a CD and HDD. Once I am booted up into a system. It all looks the exact same. How can i tell if I am actually running from the CD?

I am trying to implement the command into a script that is dangerous if run from anything except a CD. Currently it happily runs on a HDD and proceeds to mess everything up.

Thanks

[GNU-Fan]

The dmesg command gives the kernel log. Search the line with "Kernel command line:".

[Buckiller]

The dmesg command gives the kernel log. Search the line with "Kernel command line:".

Nice thinking.

Unfortunately both instances of the OS (on cd, hdd, usb stick, etc) has the same root=/dev/ram0. Using slax linux.

[Buckiller]

losetup -a gives me something pretty decent... where the modules are getting loaded from. Might be specific to Slax though.