Still, after almost 40 years, Kernighan and Pike's book is a great reference https://en.wikipedia.org/wiki/The_Unix_Programming_Environment https://en.wikipedi

Still, after almost 40 years, Kernighan and Pike's book is a great reference https://en.wikipedia.org/wiki/The_Unix_Programming_Environment https://en.wikipedia.org/wiki/The_Unix_Programming_Environme... It may be a bit dated in some inconsequential details, but it is an extremely refreshing and fun read.