Using perl to replace file content

In the build.gradle.kts has a versionNumber variable, the content is like below:versionName = "1.0"

And I want to replace it with a build number on the bash script, the build number will increase every time when the bash script executes, the new versionNumber should like below:versionName = "1.0.test.1"

The test is the test environment, and the last 1 is the build number, we can use the perl to update the file content like below:

The content of the build.gradle.ktsversionName = "1.0"

The replace command:perl -pi -e 's/versionName = \"(.*?)\"/versionName = \"$1.test.1\"/g' build.gradle.kts

After execute the command above, the content of the build.gradle.kts will like below:versionName = "1.0.test.1"

Replace content in bash script#!/bin/bashbuildNumber=1
env=testperl -pi -e "s/versionName = \"(.*?)\"/versionName = \"\$1.$env.$buildNumber\"/g" build.gradle.kts

Because the pattern should has $1 , so on the bash script, we need escape the $ sign before $1 .