Linux bash scripts [duplicate]

Question

Possible Duplicate:
How do I test if a variable is a number in bash?

I am new to bash scripts. Needed a code to check whether a variable is a number, if YES i have to keep it as it, if NO i ll have to reassign it to some other value. How do I get this done?

Some particular number or that it's not a non-number? Integer or float? What have you tried? — Dennis Williamson
– Dennis Williamson, Commented Aug 30, 2012 at 14:27

Rody Oldenhuis · Accepted Answer · 2012-08-30 14:24:11Z

0

Your basic if () then ... fi. Here's the format:

#!/bin/bash

var=2

if [[ $var != 1 ]]
then
    var=5;
fi

echo $var

Note that the [[...]] format can actually be one of many things.

As with everything, if you want to get good at it, you'll have to work for it. Type

man bash
man test

to get the manuals on the tools you're using. Read them top to bottom, again, again, and once more. And then tomorrow the same thing.

answered Aug 30, 2012 at 14:24

Rody Oldenhuis

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