A file list is a type of file (a file with a .xcfilelist file extension) that contains the file paths to inputs or outputs of a build phase shell script, separated by newline characters. Although file lists are provided at build time, they allow you to maintain the inputs and outputs of shell scripts outside of the project file.
Note: If you use build settings in the file paths, they will be replaced with the build setting values of the target that is using the file list.