Use the LISTFILE command to display the file specifications used to build the file. This command lists descriptions of one or more disk files at the level of detail you select. The level of display detail is controlled by the option number or keyword parameter following the file name.
A KSAM XL file does not have a unique file code. The file's structure can be discerned from a LISTFILE display using option 1 (SUMMARY) or 2 (DISC). When displayed in this manner, the character K is appended to the file type of a KSAM XL file to distinguish it from standard files. A file code of KSAM identifies a CM KSAM data file. A file code of KSAMK identifies a CM KSAM key file. The following example displays summary information for a KSAM XL file, a CM KSAM key file, a CM KSAM data file, and a standard file.
Two options display the key specifications for a KSAM XL file. Option 5 (DATA) displays the file specifications and key data for the file. Option 7 (UNIQUE) displays information that is unique to the file type. For KSAM files, this displays the key data without the file specifications.
Figure 3-2 “File Information Display” provides an example of the LISTFILE command using option 5 (DATA) and the display it generates.
For a KSAM file, the file specifications, as well as the key information specified when the file was built, is displayed. (Note that the keyword DATA could have replaced the option number 5 in the LISTFILE request in the preceding example.) This display could be abbreviated to display only the key data by using option 7 (UNIQUE) as shown in Figure 3-3 “Key Information Display”.
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