&SYSLIST

&SYSLIST indicates whether the CONTROL statement's LIST or NOLIST option is active. The value ON indicates that CONTROL LIST is active, and TSO/E commands and subcommands are displayed at the terminal after symbolic substitution. The value OFF indicates that CONTROL NOLIST is active, and commands and subcommands are not displayed at the terminal after symbolic substitution.

Your CLISTs can use &SYSLIST to test which option is in effect, or to change the option. For example, if you suspect an error in part of a CLIST and you want to display certain commands or subcommands, you can code:

SET &SYSLIST = ON
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  (suspected commands in error)
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SET &SYSLIST = OFF