Merge tag '0.66'

[PuTTY.git] / doc / plink.but

diff --git a/doc/plink.but b/doc/plink.but
index 589d19ef193a7269047225b3c2e3df871fff7ad1..889d3b6acf6973c62e35f05883657fd544ebaeaf 100644 (file)
--- a/doc/plink.but
+++ b/doc/plink.but
@@ -232,6 +232,27 @@ line.
 
 (This option is only meaningful with the SSH-2 protocol.)
 
+\S2{plink-option-shareexists} \I{-shareexists-plink}\c{-shareexists}:
+test for connection-sharing upstream
+
+This option does not make a new connection; instead it allows testing
+for the presence of an existing connection that can be shared.
+(See \k{config-ssh-sharing} for more information about SSH connection
+sharing.)
+
+A Plink invocation of the form:
+
+\c plink -shareexists <session>
+\e                    iiiiiiiii
+
+will test whether there is currently a viable \q{upstream} for the
+session in question, which can be specified using any syntax you'd
+normally use with Plink to make an actual connection (a host/port
+number, a bare saved session name, \c{-load}, etc). It returns a
+zero exit status if a usable \q{upstream} exists, nonzero otherwise.
+
+(This option is only meaningful with the SSH-2 protocol.)
+
 \H{plink-batch} Using Plink in \i{batch files} and \i{scripts}
 
 Once you have set up Plink to be able to log in to a remote server