Echo variable in dos batch file

It is also possible to declare your variable using indexes so you may retrieve specific information. This will create multiple variables, with the illusion of an array:. Note that in the example above, you cannot reference var without stating what the desired index is, because var does not exist in its own. This example also uses setlocal enabledelayedexpansion in conjunction with the exclamation points at! You can view more information about this in the Variable Substitution Scope Documentation.

The second line is not working within a command block used for example on an IF condition or on a FOR loop as delayed expansion would be needed instead of standard environment variable expansion. The Windows command interpreter does not support bit integer values or floating point values in arithmetic expressions. Using quotation marks to eliminate spaces In order to prevent spaces, use quotation marks around the entire assignment; the variable name and value.

But this behaviour does mean that you cannot change a variable's value inside a block! Advanced variable substitution Now, an advanced technique. Declare multiple variables When multiple variables are defined at the beginning of the batch, a short definition form may be used by employing a replacement string. Previous Next. The following example shows arithmetic operators can be used in batch files. In any programming language, there is an option to mark variables as having some sort of scope, i.

Normally, variable having a global scope can be accessed anywhere from a program whereas local scoped variables have a defined boundary in which they can be accessed. DOS scripting also has a definition for locally and globally scoped variables.

By default, variables are global to your entire command prompt session. The following example shows the difference when local and global variables are set in the script.

If you have variables that would be used across batch files, then it is always preferable to use environment variables. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Making Agile work for data science. Stack Gives Back Featured on Meta. New post summary designs on greatest hits now, everywhere else eventually.

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