• If you have entered more than one condition, and if all conditions must be met before the dependent task can run, select a condition type of All. Select a condition type of Any if the dependent task can run after any of the conditions has been met. Choose how to handle task failures.
  • This option is currently required to use more CPUs than are bound to a GRES (i.e. If a GPU is bound to the CPUs on one socket, but resources on more than one socket are required to run the job). This option may permit a job to be allocated resources sooner than otherwise possible, but may result in lower job performance.
  • Nevertheless, it’s a skill that becomes invaluable as you gain seniority and start doing more DevOps in you day job, or if you want to do some high-speed, low drag stuff to tailor your development environment like this.
  • Batch Script Tutorial
  • Batch Script Resources
  • Selected Reading

Batch file multiple commands for loop.

There are two types of variables in batch files. One is for parameters which can be passed when the batch file is called and the other is done via the set command.

Command Line Arguments

Batch scripts support the concept of command line arguments wherein arguments can be passed to the batch file when invoked. The arguments can be called from the batch files through the variables %1, %2, %3, and so on.

The following example shows a batch file which accepts 3 command line arguments and echo’s them to the command line screen.

If the above batch script is stored in a file called test.bat and we were to run the batch as

Following is a screenshot of how this would look in the command prompt when the batch file is executed.

The above command produces the following output.

If we were to run the batch as

The output would still remain the same as above. However, the fourth parameter would be ignored.

Set Command

The other way in which variables can be initialized is via the ‘set’ command. Following is the syntax of the set command.

Syntax

where,

  • variable-name is the name of the variable you want to set.

  • value is the value which needs to be set against the variable.

  • /A – This switch is used if the value needs to be numeric in nature.

The following example shows a simple way the set command can be used. Chapter 1 completedlet us c solutions.

Example

  • In the above code snippet, a variable called message is defined and set with the value of 'Hello World'.

  • To display the value of the variable, note that the variable needs to be enclosed in the % sign.

Output

The above command produces the following output.

Working with Numeric Values

In batch script, it is also possible to define a variable to hold a numeric value. This can be done by using the /A switch.

The following code shows a simple way in which numeric values can be set with the /A switch.

Than
  • We are first setting the value of 2 variables, a and b to 5 and 10 respectively.

  • We are adding those values and storing in the variable c.

  • Finally, we are displaying the value of the variable c.

The output of the above program would be 15.

All of the arithmetic operators work in batch files. The following example shows arithmetic operators can be used in batch files.

The above command produces the following output.

Create a batch file

Local vs Global Variables

In any programming language, there is an option to mark variables as having some sort of scope, i.e. the section of code on which they can be accessed. 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. Call the SETLOCAL command to make variables local to the scope of your script. After calling SETLOCAL, any variable assignments revert upon calling ENDLOCAL, calling EXIT, or when execution reaches the end of file (EOF) in your script. The following example shows the difference when local and global variables are set in the script.

Example

Few key things to note about the above program.

Useful Batch Files

  • The ‘globalvar’ is defined with a global scope and is available throughout the entire script.

  • The ‘var‘ variable is defined in a local scope because it is enclosed between a ‘SETLOCAL’ and ‘ENDLOCAL’ block. Hence, this variable will be destroyed as soon the ‘ENDLOCAL’ statement is executed.

Output

The above command produces the following output.

You will notice that the command echo %var% will not yield anything because after the ENDLOCAL statement, the ‘var’ variable will no longer exist.

Windows Batch File Basics

Working with Environment Variables

If you have variables that would be used across batch files, then it is always preferable to use environment variables. Once the environment variable is defined, it can be accessed via the % sign. The following example shows how to see the JAVA_HOME defined on a system. The JAVA_HOME variable is a key component that is normally used by a wide variety of applications.

How To Code Batch Files

The output would show the JAVA_HOME directory which would depend from system to system. Following is an example of an output.

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