Batch file environment variable exists

So the safest way for CMD. Now let's investigate variables a little further in Windows NT 4 and later. Type the following commands on the command line, or copy them to a batch file and run that batch file:. Note my highlighting: the last command, SET Date , tells us that the variable Date is not defined, but we can clearly see it is.

It looks like these "hidden" variables are defined, but the SET command doesn't see them as defined unless their values are set in the CMD. This is also my preferred way of doing this. The question is also a duplicate of: Check if an environment variable is defined without command extensions and without using a batch file? Stack Overflow for Teams — Collaborate and share knowledge with a private group.

Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. How to check if a variable exists in a batch file? Ask Question. Asked 5 years, 8 months ago. Active today. Viewed 86k times. I am using the call command: call beingcalled. Improve this question. Fivos Capone Fivos Capone 1 1 gold badge 3 3 silver badges 9 9 bronze badges.

What about if defined calltwo? There is a crucial difference in your need between "test if is set exists " and "test if the value is not empty" — Sandburg. Add a comment. Active Oldest Votes. Improve this answer. Rishav Rishav 3, 28 28 silver badges 48 48 bronze badges. Learn more. How do you check if environment variables are defined in windows batch scripting [closed] Ask Question.

Asked 4 years, 9 months ago. Active 4 years, 1 month ago. Viewed 10k times. Improve this question. DJezus DJezus 1 1 gold badge 1 1 silver badge 11 11 bronze badges. Compo The MyVar variable is supposed to be an "environment variable" and when you run the program in cmd.

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