Scripting
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Shell Programming
Last revision August 6, 2004 Expressions can be used in assigning values to new variables; as substitutions in command lines in the script; and in flow-of-control statements : if , foreach , while , and switch .
In the following list, variables that accept values are shown with the equals sign followed by the type of value they accept; the value then is described. (Note, however, that variables such as argv , cwd , or status are never explicitly assigned.)
Variables (Linux in a Nutshell, 3rd Edition)
Processing command line arguments is a pain in any language. If done manually, parsing even a few options and option value pairs in BASH is a huge pain. As such and given the nature of shell scripts, they usually have exceedingly poor options processing.
The 60 second getopts tutorial
Linux gurus don’t use cut , awk , and sed when they want to replace or strip out a portion if a variable. They use parameter substitution.
10 Steps to Beautiful Shell Scripts
Advanced Bash-Scripting Guide
This tutorial assumes no previous knowledge of scripting or programming, but progresses rapidly toward an intermediate/advanced level of instruction . . . all the while sneaking in little nuggets of UNIX ® wisdom and lore . It serves as a textbook, a manual for self-study, and a reference and source of knowledge on shell scripting techniques.
by mike December 7, 2011 TweetFlow The order in which you set up commands to execute is called flow.