HP MPE/iX 6.x Operating System manual 153

Table 6-8. File Access Mode Types

Access Mode	:FILE Parameter	Description
Read only	IN	Allows you to read a ￿le, but not to write on it.
Write only	OUT	Allows you to write on a ￿le, but not to read it.
		Any data already in the ￿le is deleted when the
		￿le is opened.
Write (save) only	OUTKEEP	Allows you to write on a ￿le, but not to read it.
		You can add new records both before and after
		current end-of-￿le indicator.
Append only	APPEND	Allows you to append information to a ￿le, but
		not to overwrite the current information or read
		the ￿le. You can add new records only after the
		current end-of-￿le indicator. Used when presen t
		contents of a ￿le must be preserved.
Input/output	INOUT	Allows unrestricted input and output access of
		￿le. Information already on the ￿le is sa ved when
		the ￿le is opened. (In general, it com bines the
		features of IN and OUTKEEP .)
Update	UPDATE	Allows use of FUPDATE intrinsic to alter records in
		a ￿le. Record is read in to your data stack, altered,
		and rewritten to the ￿le. All data already in the
		￿le is saved when the ￿le is opened.

Specifying File Access by Type or User

Restrictions on accessing a ￿le are established when the ￿le is created according to the default established for the group and accoun t where the ￿le resides.

The capabilities of a user who accesses a ￿le can determine the securit y restrictions applied. Table 6-9 describes the t ypes of users recognized b y the MPE/iX Securit y System, their mnemonic codes, and de￿nitions.

File System 6-39