If a command, CLIST, or REXX exec requires the file or subdirectory path name in a position other than the first operand or if other operands are needed, you can use the path name substitution character to represent the path name. If no operands are specified after the command, ISPF uses the path name of the file or subdirectory that is being acted on as the first operand of the command.

The ISPF-defined default for the path name substitution character is the exclamation point (!) character. You can change the value of this character using the z/OS® UNIX Directory List Options panel.

For example, if you specify: CLIST1 FILE(!) DEBUG in the line command field for file test_data in directory u/myhome the effect will be the same as if you had entered this primary command:

TSO CLIST1 FILE('/u/myhome/test_data') DEBUG