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+.TH STICKY 8
+.UC 4
+.SH NAME
+sticky \- executable files with persistent text
+.SH DESCRIPTION
+While the `sticky bit', mode 01000 (see
+.IR chmod (2)),
+is set on a sharable executable file,
+the text of that file will not be removed from the system swap area.
+Thus the file does not have to be fetched from the file system
+upon each execution.
+As long as a copy remains in the swap area, the
+original text cannot be overwritten in the file system,
+nor can the file be deleted.
+(Directory entries can be removed so long as one link remains.)
+.PP
+Sharable files are made by the
+.B \-n
+and
+.B \-z
+options of
+.IR ld (1).
+.PP
+To replace a sticky file that has been used do:
+(1) Clear the sticky bit with
+.IR chmod (1).
+(2) Execute the old program to flush the swapped copy.
+This can be done safely even if others are using it.
+(3) Overwrite the sticky file.
+If the file is being executed by any process,
+writing will be prevented; it suffices to simply remove the file
+and then rewrite it, being careful to reset the owner and mode with
+.I chmod
+and
+.IR chown (2).
+(4) Set the sticky bit again.
+.PP
+Only the super-user can set the sticky bit.
+.SH BUGS
+Are self-evident.
+.PP
+Is largely unnecessary on the VAX; matters only for large programs that
+will page heavily to start, since text pages are normally cached incore
+as long as possible after all instances of a text image exit.