Dos batch file check empty string

Basic string operations in batch like you are used to from other programming languages. Add leading spaces to a string to make sure the output lines up.

Script Output. The example shows how to return the first 4 characters of a string. The key-value pairs are listed in the map variable separated by semicolon. Key and value itself are separated by one dash character.

Same can be used to tranlate a day-of-the-week short string into a day-of-the-week long string by changing the map content only. The example here shows how to extract the parts of a date. Find centralized, trusted content and collaborate around the technologies you use most.

Connect and share knowledge within a single location that is structured and easy to search. Why this was in guide. Did it work in past? Example from here. I deleted some whitespaces in the end of 2nd, 3rd and 5th last lines and everything works now as expected, what is going on? An environment variable cannot have an empty string. The environment variable is not defined at all on assigning nothing to an environment variable.

The help of command IF output on running in a command prompt window explains the syntax:. This works as long as command extensions are enabled as by default on starting cmd. The square brackets have no meaning for command IF or for Windows command processor. But double quotes have one as they define an argument string. So possible is also using:.

Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. In general, this is a more reliable method than using square brackets because it will work even if the variable has spaces in it. This is just an example, you just need to customize 2 or 3? I created this small batch script based on the answers here, as there are many valid ones.

Feel free to add to this so long as you follow the same format:. So if you wanted to write in pseudo :. February 27, Windows Leave a comment.