X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=blobdiff_plain;f=doc%2Fplink.but;h=553639e6e97cc8bf2d237f84db195491cb5801c1;hb=5471539a6738484b48fb938c88dce547a3e4b299;hp=b09cd1928b069cb494b21d659944282a469b3929;hpb=8c09f85a64ff31d05f37304a041fd766507a19f0;p=PuTTY.git

diff --git a/doc/plink.but b/doc/plink.but
index b09cd192..553639e6 100644
--- a/doc/plink.but
+++ b/doc/plink.but
@@ -80,6 +80,8 @@ use Plink:
 \c   -N        don't start a shell/command (SSH-2 only)
 \c   -nc host:port
 \c             open tunnel in place of session (SSH-2 only)
+\c   -shareexists
+\c             test whether a connection-sharing upstream exists
 
 Once this works, you are ready to use Plink.
 
@@ -230,6 +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