I certainly do not have much knowledge about linux, and I have not read through many linux books to be a good advisor, but this is one (old) book that I found useful, and quite enjoyable on a train journey  , its rather nice for getting a basic idea of linux/unix concepts -
http://www.tldp.org/LDP/gs/gs.html
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Hardware - Celeron 266 MHz, 128MB RAM, Intel i740 8MB RAM
Software - Slackware Linux 10.1; Archlinux 0.7; Windows 98 SE
Humanware - GS/CS C++ L+++ w b+++ DI+ D+ e
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