If you really like living dangerously I'll show you a basic hack.
Run this command:
While on the list of entries press Sys-Req and take option 3. On PC
keyboards this is often mapped to Shift-Esc
14. Display open files, if active
The open file with a member name of SERVICES (not the file name!) is the
one you want.
IBM protects you from directly updating the file yourself, irregardless of
what level of security you have. If you do a DSPFD on the file you will
Allow read operation . . . . . . . . . . . : Yes
Allow write operation . . . . . . . . . . . : No
Allow update operation . . . . . . . . . . : ALWUPD *NO
Allow delete operation . . . . . . . . . . : ALWDLT *NO
So, the only way to update it is to use the provided APIs like ADDSRVTBLE
Here's another clue:
WHERE COLUMN_NAME IN('SERVICE', 'PORT', 'PROTOCOL')
ORDER BY TABLE_NAME, COLUMN_NAME;
It's one of the tables with all three.
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