Set batch variable

Command line arguments are the strings following the program name in the command that invokes the program. If given in short form, it is just the name; if given in long form, the name is preceded by the path that was used, set batch variable.

SET command invoked with just a variable name, no equal sign or value will display the value of all variables whose prefix matches the name given to the SET command. For example:. However, SET command will allow an equal sign in the value of an environment variable in any position other than the first character. The expression evaluator is pretty simple and supports the following operations, in decreasing order of precedence:. If you use any of the logical or modulus operators, you will need to enclose the expression string in quotes. Any non-numeric strings in the expression are treated as environment variable names whose values are converted to numbers before using them. If an environment variable name is specified but is not defined in the current environment, then a value of zero is used.

Set batch variable

Connect and share knowledge within a single location that is structured and easy to search. I'm learning batch script and I made some good progress little, but enough to help me saving time. Now I'd like to work with variables. But I don't have any idea on how to use them with "IF" statements. Note: it shows --language 0:eng twice. It should show --language 0:eng and then --language 0:spa. Based on the code you provided, one of two solutions is likely your best bet:. I haven't seen the data you're working with and am not familiar with mkvmerge , but let's say that there are flags for each language available in your file:. For available languages those that have a flag or whatever has predetermined them , it sets that language's argument and a space as a variable - and for languages that are not available, their variable is empty. At the end of the loop it will use mkvmerge and all of the language variables you have if exist else statements for. Obviously this is not your for-loop, but structuring the contents of your loop this way should give you the desired output. If you have any questions on how to take this further just let us know. Stack Overflow for Teams — Start collaborating and sharing organizational knowledge. Create a free Team Why Teams? Learn more about Teams.

Menu Categories. If the length is not specified, then it defaults to the remainder of the variable value. Our partnership with Google and commitment to socially responsible AI.

Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Displays, sets, or removes cmd. If used without parameters, set displays the current environment variable settings. The set command can also run from the Windows Recovery Console, using different parameters. If command extensions are enabled the default and you run set with a value, it displays all of the variables that begin with that value. If you use quotation marks to enclose a string that contains one of the special characters, the quotation marks are set as part of the environment variable value.

We can declare variables in batch programming using the SET keyword. These variables exist in the running session of the dos window. Set command is an example of this. The variable will not exist after the dos window is closed or session execution is closed in the current user context. These are system or machine levels. On this page How to declare and use variables in batch programming using the set command How to prompt to read the value from the command line and store it in a variable How to read and store numeric numbers in variable batch programming? How to read command line parameters in DOS batch programming?

Set batch variable

In one sense, there are two categories of variables for the command line. See the discussion on this page. However, the term "variable" is normally reserved in command line usage for entities that are declared as environment variables with the "set" command. Note that this is a pretty primitive way to define variables. For example, there is no typing. Environment variables, including numbers, are stored as strings and operations with them have to take that into account. Variables are declared and given a value in a single statement using "set". Some characters are reserved and have to be escaped. They should be avoided. These include the symbols in Table II on this page.

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In the following examples, these are illustrated in that order. EXE for batch files parent folder, always terminated with a trailing backslash. The Overflow Blog. If you use any of the logical or modulus operators, you will need to enclose the expression string in quotes. If an environment variable name is specified but is not defined in the current environment, then a value of zero is used. The set command is often used in the Autoexec. You can also store a math expression in a variable and substitute in different values, rather like a macro. Skip to main content. Delayed environment variable expansion allows you to use a different character the exclamation mark to expand environment variables at execution time. Menu Categories. Batch Script - Variables. The CALL SET syntax will expand any variables passed on the same line, which is useful if you need to set one variable based on the value of another variable. They will appear at the CMD prompt. For available languages those that have a flag or whatever has predetermined them , it sets that language's argument and a space as a variable - and for languages that are not available, their variable is empty.

For example, when copying a specific file and then moving it to a copied folder, you end up writing the same path multiple times like this:. Although this is not a problem, writing the same string multiple times can cause typing errors and make corrections difficult.

COM actually will be unable to find it because it hasn't a clue to the first part of the filespec. By default, variables are global to your entire command prompt session. There are two types of variables in batch files. The set command can also run from the Windows Recovery Console, using different parameters. More on integer math, and its limitations, can be found on my Batch math and PHP based batch files pages. One is for parameters which can be passed when the batch file is called and the other is done via the set command. Only new CMD prompts will get the new setting. Following is a screenshot of how this would look in the command prompt when the batch file is executed. There are a few built-in environment variables that are always available: PATH The path to any file is the drive letter or network volume , colon, backslash, and a list of backslash delimited nested directories that tells where it is. The Overflow Blog. In the above code snippet, a variable called message is defined and set with the value of "Hello World". Submit and view feedback for This product This page.