Validating user input in shell script updating escd success verifying dmi pool data

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When coding in a script, or even in a fully-featured software application, it's important to account for as many scenarios as possible.

To limit the number of possible scenarios, it's a best practice to incorporate some kind of input validation into your code.

The validation routine in this script makes sure that negative numbers are correctly formatted, and, to make it more generally useful, it can also check that values are within a range specified by the user . This nonnegative value is then stripped of digits, and what remains is tested further.

You might be tempted to use a logical AND to connect expressions and shrink some of the nested Upon first glance, the process of validating a floating-point (or "real") value within the confines and capabilities of a shell script might seem daunting, but consider that a floating-point number is only two integers separated by a decimal point.

You may have ended up writing thousands of lines of code to cover every possible scenario where the user could mess up the input.

Or maybe it has a -File Path parameter to enable the user to run your script against different files. The moment you allow a user to dictate what goes into your script is the moment your well-laid plans for how the script execution should go have the potential to fail miserably.

For example, a -Computer Name parameter is innocent enough.

Couple that insight with the ability to reference a different script inline ( #!

/bin/sh # validfloat -- Tests whether a number is a valid floating-point value.

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