https://developer.apple.com/library/archive/qa/qa1827/_index.html

agvtoolUsage.txt

Notes about agvtool

1) Enable agvtool.
2) Set up your version and build numbers.

## sampleUsage:
agvtool new-marketing-version <your_specific_version>
xcrun agvtool new-marketing-version 2.0

—--Build--—
// Set Specific build number to 6
agvtool new-version -all 6
// Bump build number
agvtool next-version -all

—--Version--—
// Set Specific version number 1.3
agvtool new-marketing-version 1.3

// Get current version
xcrun agvtool what-version

agvtool - Apple-generic versioning tool for Xcode projects
  usage:
    agvtool help
    agvtool what-version | vers [-terse]
    agvtool [-noscm | -usecvs | -usesvn] next-version | bump [-all]
    agvtool [-noscm | -usecvs | -usesvn] new-version [-all] <versNum>
    agvtool [-noscm | -usecvs | -usesvn] tag [-force | -F] [-noupdatecheck | -Q] [-baseurlfortag]
    agvtool what-marketing-version | mvers [-terse | -terse1]
    agvtool [-noscm | -usecvs | -usesvn] new-marketing-version <versString>