You can use the .strsub command to swap one string for another in files; a common use is to replace a standard token with a system variable such as the $B variable that provides the current job number.
You can use the .strsub dot command to embed build or version numbers in code files. By placing a .strsub command early in your project, a later step can compile files that contain the updated information.
Application version 5.0.123 Application version 5.0._BUILD_
.strsub _BUILD_ $B README.TXT
Application version 5.0.3
.strsub _MAJORVERSION_ $MAJORVERSION README.TXT .srsub _MINORVERSION_ $MINORVERSION README.TXT