Update unix-tips.md

dnorton · May 8, 2017 · 9534721 · 9534721
1 parent 071d24b
commit 9534721
Showing 1 changed file with 8 additions and 2 deletions.
diff --git a/unix-tips.md b/unix-tips.md
@@ -278,9 +278,9 @@ curl -s http://get.sdkman.io | bash
 sdk install kotlin
 ```
 
-* update DNS (Windows DNS)
+* update DNS (Windows DNS) -- [nsupdate](http://linuxcommand.org/man_pages/nsupdate8.html)
 
-+ [nsupdate](http://linuxcommand.org/man_pages/nsupdate8.html)
+* [less commands](https://en.wikipedia.org/wiki/Less_(Unix))
 
 ### file permissions (`chmod`)
 
@@ -336,6 +336,12 @@ $ /usr/sbin/lsof -Pnl +M -i4
 ping -t 8.8.8.8
 ```
 
+* test connectivity to a TCP or UPD port
+
+```bash
+nc -z <IP or host> <port> (e.g., nc - z dev1-app1 1234)
+```
+
 ### `curl` commands
 
 * run curl with the .cer