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udev man page: add operators

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Patch from: Hannes Reinecke <hare@suse.de>

Signed-off-by: Kay Sievers <kay.sievers@suse.de>
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Kay Sievers 2005-06-14 13:28:24 +02:00
parent 60d7b20100
commit 0fa98832b5
1 changed files with 30 additions and 0 deletions
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udev.8.in
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@ -104,6 +104,36 @@ Every rule consists of a list of comma separated key value fields:
.sp
.IR "key " ,[ "key " ,...]
.P
Each key has the following format:
.sp
.IR "name op value"
.P
There are distinct key operation types, depending on the type of the key, it
does a comparison or an assignment.
.P
Comparison operators are:
.TP
.B ==
Compare for equality.
.TP
.B !=
Compare for non-equality.
.P
Assignment operators are:
.TP
.B +=
Add the value to a key that holds a list of entries.
.TP
.B :=
Assign a value to a key finally; disallow any later changes, which
is useful to prevent changes by any later rules.
.TP
.B =
Asign a value to a key. Keys that represent a list, are reset and only this
single value is assigned. While this operator still works inplicitely as
comparison on keys that can't get a value assigned, its usage as an comparison
operator is deprecated.
.P
The following key names can be used to match against device properties:
.TP
.B BUS