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fter writing many scripts, I realized there were several functions and routines I was using repeatedly. Sometimes I would write the code for these duplicated functions again, and other times I would copy and paste the code from an earlier script. But the best coding practice is to keep a file around that contains all of your already tested and working functions. This creates a scriptwriter s toolbox, or, in programming speak, a library. With a library in place, many of the tools you need often are close at hand and you don t have to code the functions anew each time you need them. This chapter shows you how to set up a standard function library and how to utilize the library in your scripts.
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The Library File
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The library itself is simply a collection of functions held in a single file. When the library is brought into your script s environment, you can call any of the library functions as if they were in your original code. You could create a single library that contains all of your functions or, if you have a large and varied number of them, create a set of libraries where each one is specific to a category of coding. Libraries are not only handy to have around; they eliminate redundant coding as well as provide a common environment for all programmers involved to work from. Function libraries reduce redundant code and speed up the development process, plus they can reduce debugging and code-hardening time. If there are bugs in any of the functions, fixes will positively impact all scripts that rely on those bits of code. Function libraries can also level the programming field when working with many and varied system types by adding a layer of abstraction between system differences and the programmer writing the code. The following example library is very simple and contains only a single function. To keep things organized, especially when files get large, you should write the functions with good indenting form as well as comments about what the code does. Include in the library file a header that lists all the functions and gives a brief description of each, along with any variables that get defined. With the header you could include a list of revisions and owners. This is especially useful when working in a team where other members may be making changes.
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CHAPTER 2 STANDARD FUNCTION LIBRARY
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#!/bin/echo Warning: this library should be sourced! # ostype(): Define OSTYPE variable to current operating system ostype() { osname=`uname -s` # Assume we do not know what this is OSTYPE=UNKNOWN case $osname in "FreeBSD") OSTYPE="FREEBSD" ;; "SunOS") OSTYPE="SOLARIS" ;; "Linux") OSTYPE="LINUX" ;; esac return 0 }
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The first line of the library is an excellent method of ensuring that the library is sourced rather than executed as a regular script. With this line, error output will be generated if someone attempts to run the library instead of sourcing it into the environment. The output would look like this:
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Warning: this library should be sourced! /path_to_library
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Another way to avoid execution of libraries is to make them nonexecutable. The first function, ostype(), determines the operating system of the computer on which the library is running. Because there are subtle differences between operating systems, knowing what OS your script is running on will help you take the differences into account. There are, of course, many more operating systems than we are able to list here.
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Some Useful Functions
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The code in this section comes from a few utility functions that I find very useful. You will probably come up with many more that are specifically geared toward the systems you work with. Gentoo Linux provides an excellent example of a library of shell functions. If you re running this Linux distribution, you can find the library under the filename /etc/init.d/functions.sh. Even if you re not a Gentoo user, you should be able to get a copy of this library and use it by performing an Internet search for Gentoo and functions.sh, making sure that you follow the applicable usage guidelines contained within the file. The following are a few functions that I ve found particularly useful to include in my standard library. The first function is fairly straightforward, but it contains a cool trick. Pass this function any number, and it will determine whether the number is even or odd. This function was originally used in a moderately large environment where various tasks needed to be load-balanced. We chose a simple method of splitting the environment in
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