add command line option -E for path settings - implemented already weeks ago

svn path=/trunk/; revision=21690

doc/wireshark.pod

@@ -25,6 +25,7 @@ S<[ B<-n> ]>
 S<[ B<-N> E<lt>name resolving flagsE<gt> ] >
 S<[ B<-o> E<lt>preference/recent settingE<gt> ] ...>
 S<[ B<-p> ]>
+S<[ B<-P> E<lt>Path settingE<gt>]>
 S<[ B<-Q> ]>
 S<[ B<-r> E<lt>infileE<gt> ]>
 S<[ B<-R> E<lt>read (display) filterE<gt> ]>
@@ -361,6 +362,20 @@ traffic sent to or from the machine on which B<Wireshark> is running,
 broadcast traffic, and multicast traffic to addresses received by that
 machine.
 
+=item -P E<lt>Path SettingE<gt>
+
+Special path settings usually detected automatically. This is used for 
+special cases, e.g. starting Wireshark from a known location on an USB stick.
+
+The criterion is of the form I<test>P<:>I<value>, where I<test> is one of:
+
+B<persconf>:pathI<value> path of personal configuration filesI<value> like the 
+preferences files.
+
+B<persdata>:path<value> path of personal data files I<value>, it's the folder 
+initially opened. After the initilization, the recent file will keep the 
+folder last used.
+
 =item -Q
 
 Cause B<Wireshark> to exit after the end of capture session (useful in