Create a build specification file and include it with your source code. In this file, specify the commands you want to run in each phase of the build lifecycle. For more information, see the Build specification reference for CodeBuild .

Use the CodeBuild console to create a build project. In Insert build commands , for Build commands , enter the commands you want to run in the build phase. For more information, see Create a build project (console) .

Use the CodeBuild console to change the settings of a build project. In Insert build commands , for Build commands , enter the commands you want to run in the build phase. For more information, see Change a build project's settings (console) .

Use the AWS CLI or AWS SDKs to create a build project or change the settings of a build project. Reference the source code that contains a buildspec file with your commands, or specify a single string that includes the contents of an equivalent buildspec file. For more information, see Create a build project or Change build project settings .

Use the AWS CLI or AWS SDKs to start a build, specifying a buildspec file or a single string that includes the contents of an equivalent buildspec file. For more information, see the description for the buildspecOverride value in Run builds manually .

You can specify any Shell Command Language (sh) command. In buildspec version 0.1, CodeBuild runs each Shell command in a separate instance in the build environment. This means that each command runs in isolation from all other commands. Therefore, by default, you cannot run a single command that relies on the state of any previous commands (for example, changing directories or setting environment variables). To get around this limitation, we recommend that you use version 0.2, which solves this issue. If you must use version 0.1, we recommend the following approaches: