shell scripting

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http://www.aboutlinux.info/2005/10/configuring-xterm-in-linux.html A number of excellent Xterm alternatives are XFCE terminal, gnome-terminal, and Konsole. Xterm is a terminal which runs in X. In Linux when you open xterm, you get a small window with a small - hard to read - font by default.

Configuring Xterm in Linux | All about Linux - Vimperator

Explained by examples rather than by definitons

Awk/Nawk/Gawk Intro - Vimperator

http://www.well.ox.ac.uk/~johnb/comp/awk/awk.html
bash