man page: document when substitutions are applied for RUN and other keys

[elogind.git] / udev.7

diff --git a/udev.7 b/udev.7
index a7e2f5a4e77b691ec335cf08cb7851fb8cb71632..711bd0861b0d1d99c247c0155d10d740dfbd1edb 100644 (file)
--- a/udev.7
+++ b/udev.7
@@ -164,10 +164,13 @@ The
 \fBNAME\fR,
 \fBSYMLINK\fR,
 \fBPROGRAM\fR,
-\fBOWNER\fR
-and
+\fBOWNER\fR,
 \fBGROUP\fR
-fields support simple printf\-like string substitutions:
+and
+\fBRUN\fR
+fields support simple printf\-like string substitutions. The
+\fBRUN\fR
+format chars gets applied after all rules have been processed, right before the program is executed. It allows the use of the complete environment set by earlier matching rules. For all other fields, substitutions are applied while the individual rule is being processed. The available substitutions are:
 .TP
 \fB$kernel\fR, \fB%k\fR
 The kernel name for this device.