By Ron Peters
ISBN-10: 143021841X
ISBN-13: 9781430218418
There are tens of hundreds of thousands of Linux and Unix approach directors who're pressed for time and want a right away repair. professional Shell Scripting deals speedy and simple ideas to many universal (but difficult) difficulties that will another way take hours to unravel. it is a publication for those that be aware of shell scripting, yet don’t have the time to reinvent the wheel. And it really is distilled from greater than a decade of labor performed for Intel by means of a shell scripting guru.
Read or Download Expert Shell Scripting (Expert's Voice in Open Source) PDF
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Extra resources for Expert Shell Scripting (Expert's Voice in Open Source)
Sample text
The techniques in this chapter will give you the tools to easily set default values when a variable has a null value or is otherwise undefined. Setting Defaults The following code samples demonstrate several ways to set and manage variables with default values. Although these examples all perform the same task, they do it in slightly different ways. The first example is probably the easiest to read from a human perspective, but is likely the most verbose in terms of coding efficiency. The option you choose will depend on your motives.
The following code allows users to immediately switch to the correct configuration or log directory for quick troubleshooting: APPHOME=/usr/local/apphome if [ ! sh ] then echo "Myapp is not installed on this system so jkl is not functional" return 1 fi First you define a variable containing the top of the directory subtree where the installed applications live; then you determine if the main configuration file exists. If it does not exist, the script should exit and provide a notification. Next comes the jkl() function itself.
If [ -n $string ];then... if [ $any_variable ];then... You can use this code to determine whether variables have been defined. The first example of the two applies to string variables, since the -n operation evaluates to true if the length of the supplied string variable is nonzero. However, this method also works for determining whether a numeric variable has been defined, as its value is then treated as a string. The second example simply tests a variable. Once the variable has been assigned a value, the expression will evaluate to true.
Expert Shell Scripting (Expert's Voice in Open Source) by Ron Peters
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