In regards to the real time thing, I doubt it is a FreeBSD design goal to offer a real time operating system.
At the command line level, things are some what different -- just check your GNU'isms at the door and all will be fine (for example, how gnu ls/grep handle colours) and Linux kernel specifics also of course (i.e. FreeBSD == kldload, not insmod or w/e).
Aside from a few aliases, I've never had a problem switching between different BSD and GNU userlands.
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My Journal
Thou shalt check the array bounds of all strings (indeed, all arrays), for surely where thou typest ``foo'' someone someday shall type ``supercalifragilisticexpialidocious''.
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