How set a build number from a text file

[pdo2011]

I am a new baby to Jenkins and I could not go all the old posts to look for
what I need help !

I have a Jenkins setup and my Jenkins monitors a specific file such as the
lastbuildfound.txt in builds folder. This text file contains the last
successful build no.
Whenever this text file is updated with a new build number, my Jenkins will
trigger by the FSTrigger Plugin . However, Jenkins generates a build number
in sequence such as 1, 2, or etc.
The reason I created this setup to run an automation on new build which I
don't want to involve with a build person.

The problem is that my Jenkins is not triggering by a source control, so I
want to be able to get the build number from a text build and update the
build number in Jenkins to match it.
I know that there is the EnvInject plugin but I don't know how to use it or
any methods.

Please help me to achieve this issue and give me a clear instruction /
steps.

Thanks in advance.



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[Ginga, Dick]

Build numbers are really important to Jenkins so you can't just set them. Through the Set Next Build Number plugin you can set a "larger" build number than the current one but you cannot set a smaller one. there are ways of setting the "display name" of a build to anything. See the version number plugin or the build setter plugin. The EnvInject plugin does exactly what it says. After executing one of these steps, there will be environment variables setup for any remaining steps.

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