Download Expert Shell Scripting (Expert's Voice in Open Source) by Ron Peters PDF

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By Ron Peters

There are tens of millions of Linux and Unix approach directors who're pressed for time and wish a right away repair. professional Shell Scripting bargains speedy and straightforward strategies to many universal (but difficult) difficulties that will differently take hours to unravel. it is a publication for those that comprehend shell scripting, yet don’t have the time to reinvent the wheel. And it's distilled from greater than a decade of labor performed for Intel via a shell scripting guru.

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Example text

If the value of $? is 0, then the machine is alive. The usage of the ping command is encapsulated in the setupenv() function, which I’ll present next. The switches and usage of the ping command varies among operating systems. The usage presented here will work on Linux systems. HP-UX machines would use the command ping $NODE 3 for the same functionality. isalive() { NODE=$1 $PING -c 3 $NODE >/dev/null 2>&1 if [ $? -eq 0 ] then return 1 else return 0 fi } The final function is one you’ll find useful if you need to run your scripts on multiple hosts, some for which you don’t know the exact configuration.

LOGNAME}" Both the :? and ? syntaxes are excellent for script debugging when variables need to be defined or have a real non-null value. The big advantage to this code is that the script will exit at the line where the problem was found, and the line number will be displayed. Changing the value of the text that is to be displayed to something like "is undefined" or "has a null value" will easily point you to the problem in the script. 41 42 CHAPTER 6 ■ TESTING VARIABLES AND ASSIGNING DEFAULTS :+ Syntax This syntax has the opposite effect from the previous examples, because the alternative value will be substituted for the ${} expression if the variable is defined instead of undefined.

Syntax. $LOGNAME}" Both the :? and ? syntaxes are excellent for script debugging when variables need to be defined or have a real non-null value. The big advantage to this code is that the script will exit at the line where the problem was found, and the line number will be displayed. Changing the value of the text that is to be displayed to something like "is undefined" or "has a null value" will easily point you to the problem in the script. 41 42 CHAPTER 6 ■ TESTING VARIABLES AND ASSIGNING DEFAULTS :+ Syntax This syntax has the opposite effect from the previous examples, because the alternative value will be substituted for the ${} expression if the variable is defined instead of undefined.

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