ToDo

formatted output in shell, awk and perl

string processing functions in awk and perl.

Small topics
type, which, file, alias, builit-ins vs commands
sourcing
hashbang
progress bars, output highlighting
stty erase '#'
script
dialog

make etc.

Pattern matching in the shell - filename globbing and regular expressions.

Shell in the boot/login process

True and False in shell, awk, perl and other programming languages
The if condition specifies an action depending on a condition being true (or false.) Loops like the while and for loops iterate over the loop as long as a condition is true.
Abstract programming languages have a Boolean datatype, but scripting languages are more practical and interpret any statement as true or false.

Elegy on perl and a comparison with other programming languages
Modern Perl
yet another perl tutorial

Everything You Wanted To Know About The Find command
perl and python algorithms

regex tutorial via grep
regex reference with specific reference to important unix utilities


multilingual support?

Debugging Shell Scripts
set -x
what about debugging perl and awk?

http://www.moreofit.com/similar-to/hackles.org/Top_10_Sites_Like_Hackles/