From a6bc2c946015eaddc5b4d84caccdf4a89f6df600 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?M=C3=A1rcio=20Fernandes?= <marcio.fernandes@outlook.pt>
Date: Sat, 25 Oct 2025 14:10:21 +0000
Subject: [PATCH] modified:   README.md

---
 README.md | 42 +++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 41 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 036413b..671fdea 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,43 @@
-# ssh
+# SSH
 
+## Create key
+
+```bash
+ssh-keygen -t ecdsa -b 521
+#or
+ssh-keygen -t ecdsa -b 521 -f ~/.ssh/key-ecdsa
+
+```
+
+## Copy public key
+
+```bash
+ssh-add ~/.ssh/id_ed25519
+ssh-copy-id -i ~/.ssh//ey-ecdsa.pub example_user@192.0.2.4
+```
+
+## Add existing Key
+
+```bash
+ssh-add ~/.ssh/key-ecdsa
+```
+
+## Alias
+
+```bash
+Host srv01
+    HostName srv01.lan
+    User john
+    RemoteCommand cd ~/; exec bash --login
+    RequestTTY yes
+```
+
+## Port Binding
+
+Bind local port 8001 to target-server port 80 using jump-machine.local.  
+_(local machine without direct access to target-server)_
+
+```bash
+ssh -f -N -L localhost:8001:target-server:80 usr@jump-machine.local
+```