ALTLIB command return codes

Table 1 lists all the return codes of ALTLIB command.

Table 1. ALTLIB command return codes
Return code	Meaning
0	Processing successful. Informational messages might have been issued.
4	An alternative library does not exist for this type (REXX exec or CLIST); none deactivated.
8	An application-level library already exists for this type (REXX exec or CLIST). The new application-level library was not activated. Issued only when you specify the COND parameter.
10	User- or system-level CLIST activated; User- or system-level exec cannot be activated because a REXX language processor environment has not been established. Contact your system programmer to diagnose problems with TSO/E programs IRXECUSP and IRXINIT.
16	A required ddname was not previously allocated.
20	Severe error. More information is contained in messages.