# Set bitrise build number during build
**URL:** https://discuss.bitrise.io/t/set-bitrise-build-number-during-build/8574
**Category:** Question & Answer
**Created:** [March 27, 2019, 12:07pm UTC](https://discuss.bitrise.io/t/set-bitrise-build-number-during-build/8574 "2019-03-27T12:07:01Z")
**Posts on this page:** 9
**Page:** 1
### Author:  [@jzeferino](https://discuss.bitrise.io/u/jzeferino)
#### Post date: [March 27, 2019, 12:07pm UTC](https://discuss.bitrise.io/t/set-bitrise-build-number-during-build/8574/1 "2019-03-27T12:07:01Z")
I’m trying to set the `BITRISE_BUILD_NUMBER` during the build process.
My .yml have two scripts:
1 - that sets the `BITRISE_BUILD_NUMBER` via `envman add --key BITRISE_BUILD_NUMBER --value 31`
I was expecting that after the build end, the number of the build is 31, but it uses the incremental number from the previous build.
Any feedback on this?
---
### Author:  [@fehersanyi-bitrise](https://discuss.bitrise.io/u/fehersanyi-bitrise)
#### Post date: [March 27, 2019, 1:47pm UTC](https://discuss.bitrise.io/t/set-bitrise-build-number-during-build/8574/2 "2019-03-27T13:47:57Z")
Hy there, the build number will not change like this, if you want to use the build number for somthing then use it as a base that you modify, like
`envman add --key my-build-num --value ($BITRISE_BUILD_NUMBER-43)`
I would say
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### Author:  [@jzeferino](https://discuss.bitrise.io/u/jzeferino)
#### Post date: [March 27, 2019, 2:09pm UTC](https://discuss.bitrise.io/t/set-bitrise-build-number-during-build/8574/3 "2019-03-27T14:09:32Z")
Hello, I know that, but what I need is to set the build number in bitrise with the version I want.
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### Author:  [@fehersanyi-bitrise](https://discuss.bitrise.io/u/fehersanyi-bitrise)
#### Post date: [March 27, 2019, 2:19pm UTC](https://discuss.bitrise.io/t/set-bitrise-build-number-during-build/8574/4 "2019-03-27T14:19:16Z")
could you check this guide out? -\> [https://devcenter.bitrise.io/builds/build-numbering-and-app-versioning/](https://devcenter.bitrise.io/builds/build-numbering-and-app-versioning/)
---
### Author:  [@jzeferino](https://discuss.bitrise.io/u/jzeferino)
#### Post date: [March 27, 2019, 2:23pm UTC](https://discuss.bitrise.io/t/set-bitrise-build-number-during-build/8574/5 "2019-03-27T14:23:26Z")
I already did that. I want to specify the number of the build from my build script.
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### Author:  [@fehersanyi-bitrise](https://discuss.bitrise.io/u/fehersanyi-bitrise)
#### Post date: [March 27, 2019, 2:27pm UTC](https://discuss.bitrise.io/t/set-bitrise-build-number-during-build/8574/6 "2019-03-27T14:27:53Z")
You could try this script then,
make sure to add `$BITRISE_SOURCE_DIR/magicnum.txt` to the cache push step
```auto
#!/usr/bin/env bash
# fail if any commands fails
set -e
# debug log
set -x
if [! -f $BITRISE_SOURCE_DIR/magicnum.txt]
then
touch $BITRISE_SOURCE_DIR/magicnum.txt
fi
inc=$(<$BITRISE_SOURCE_DIR/magicnum.txt)
if [-z "$inc"]
then
echo 1000 > $BITRISE_SOURCE_DIR/magicnum.txt
inc=$(<$BITRISE_SOURCE_DIR/magicnum.txt)
fi
if [$BITRISE_TRIGGERED_WORKFLOW_TITLE == "test"]
then
build_number_offset=1
envman add --key MY_BUILD_NUMBER --value $((build_number_offset + inc))
echo $(( inc + 1 )) > ./magicnum.txt
fi
```
obviously, don’t use 1000 but the number you want
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### Author:  [@jzeferino](https://discuss.bitrise.io/u/jzeferino)
#### Post date: [March 27, 2019, 3:01pm UTC](https://discuss.bitrise.io/t/set-bitrise-build-number-during-build/8574/7 "2019-03-27T15:01:07Z")
Not sure if this does what I need.
I need to change the `#2` to a custom value (ex: `1.1.1`) from the build script. Is this possible?
---
### Author:  [@fehersanyi-bitrise](https://discuss.bitrise.io/u/fehersanyi-bitrise)
#### Post date: [March 27, 2019, 3:23pm UTC](https://discuss.bitrise.io/t/set-bitrise-build-number-during-build/8574/8 "2019-03-27T15:23:19Z")
no, that you can not do, but you could create a feature request on it here: [http://discuss.bitrise.io/c/feature-request](http://discuss.bitrise.io/c/feature-request)
---
### Author:  [@system](https://discuss.bitrise.io/u/system)
#### Post date: [April 26, 2019, 3:23pm UTC](https://discuss.bitrise.io/t/set-bitrise-build-number-during-build/8574/9 "2019-04-26T15:23:25Z")
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