COMP * Command in JCL

COMP * or COMP * x is a handy command to compare the changes made to a JCL. If this command is issued in modified JCL, it will show the old and new version of the same with === and .QAAAx

For example, the program name in the modified JCL is AMBLIST1 . Using COMP * command we can easily figure out the difference between the two versions of the JCL.