To find out whether we are booted in UEFI or Legacy mode, so;
[ -d /sys/firmware/efi ] && echo UEFI || echo Legacy
Basically, if the refi file exists, we are in UEFI mode.
I'm not sure if the /sys folder is even there on < 2.6 kernels, it doesn't appear on my Slackware 8.1 (specifically for the SCS machine).
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