Add SSH Escape Sequences as a unix til

README.md

@@ -7,7 +7,7 @@ variety of languages and technologies. These are things that don't really
 warrant a full blog post. These are mostly things I learn by pairing with
 smart people at [Hashrocket](http://hashrocket.com/).
 
-_410 TILs and counting..._
+_411 TILs and counting..._
 
 ---
 
@@ -381,6 +381,7 @@ _410 TILs and counting..._
 - [Search History](unix/search-history.md)
 - [Search Man Page Descriptions](unix/search-man-page-descriptions.md)
 - [Securely Remove Files](unix/securely-remove-files.md)
+- [SSH Escape Sequences](unix/ssh-escape-sequences.md)
 - [SSH With Port Forwarding](unix/ssh-with-port-forwarding.md)
 - [Switch Versions of a Brew Formula](unix/switch-versions-of-a-brew-formula.md)
 - [Watch The Difference](unix/watch-the-difference.md)

unix/ssh-escape-sequences.md

@@ -0,0 +1,25 @@
+# SSH Escape Sequences
+
+In [Killing A Frozen SSH Session](killing-a-frozen-ssh-session.md), I talked
+about an escape sequence for breaking out of an SSH session when the pipe
+has been broken. This isn't the only SSH escape sequence though. To see the
+others, hit `<Enter>~?`. This displays a help list with all the other escape
+sequences.
+
+```
+> ~?
+Supported escape sequences:
+ ~.   - terminate connection (and any multiplexed sessions)
+ ~B   - send a BREAK to the remote system
+ ~C   - open a command line
+ ~R   - request rekey
+ ~V/v - decrease/increase verbosity (LogLevel)
+ ~^Z  - suspend ssh
+ ~#   - list forwarded connections
+ ~&   - background ssh (when waiting for connections to terminate)
+ ~?   - this message
+ ~~   - send the escape character by typing it twice
+(Note that escapes are only recognized immediately after newline.)
+```
+
+h/t Josh Davey