Check if ssh key pair matches

README.md

@@ -2,13 +2,25 @@
 
 ## vim
 
-* Set tab to 4 spaces: `set tabstop=8 softtabstop=0 expandtab shiftwidth=4 smarttab`
+* Set tab to 4 spaces:
+    ```
+    set tabstop=8 softtabstop=0 expandtab shiftwidth=4 smarttab
+    ```
 
 ## Shell
 
-* Find my public IP: `dig +short myip.opendns.com @resolver1.opendns.com`
+* Find my public IP:
+    ```
+    dig +short myip.opendns.com @resolver1.opendns.com
+    ```
+
+* Check if private and public ssh key match:
+    ```
+    diff <(cat ~/.ssh/id_rsa.pub | cut -d' ' -f 2) <(ssh-keygen -y -f ~/.ssh/id_rsa | cut -d' ' -f 2)'
+    ```
 
 
 References
 ------
 * https://stackoverflow.com/questions/1878974/redefine-tab-as-4-spaces
+* https://serverfault.com/questions/426394/how-to-check-if-a-rsa-public-private-key-pair-matched