Another question that arose from this question is: Is there any decent portable

Question

Another question that arose from this question is:

Is there any decent portable virus/malware scanner solution that:

can be placed on a bootable medium (such as a USB stick, but maybe a CD-R too)
ideally, also on a non-bootable medium (SD card) and chainloaded
has a secure way to get up-to-date signatures
and possibly software updates
can be booted on a computer (x86, for now) and scan its local filesystems for viruses and other malware (ideally, supporting most Windows, Linux, Mac OSX86, BSD, Solaris, Hurd filesystems)
command-line UI is fine
maybe GUI for those who do have more RAM
maybe serial console as boot option, for headless servers
or even network console (so you

Explanation / Answer

I use AVG Rescue CD for this. It has a simple, keyboard-navigated UI. No CLI and no rich GUI though.

It...

Is bootable (x86-only)!
Has a secure updater built-in
Can scan essentially any filesystem (FAT, NTFS, EXT, etc...)
Can scan Windows or Linux installations
Runs on a linux kernel

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