mainframe - Why the StEPLIB always overrides the JOBLIB,in JCL? -

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in jcl steplib overrides joblib.can explain why so?

the below excerpts ibm manuals , explain joblib dd statement , how steplib dd statement interacts joblib statement.

use joblib dd statement to:

  • create private library.

  • identify private library system search program named in each exec statement pgm parameter in job. if system not find program in private library, search system libraries.

relationship of steplib joblib

use joblib dd statement define private library system use entire job. if include joblib dd statement job , steplib dd statement individual job step, system first searches step library , system library program requested in exec statement. system ignores joblib library step.


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