Move pages under tldr, lint run.sh, update docs

tldr/ngrep

@@ -0,0 +1,29 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# ngrep
+
+> Filter network traffic packets using regular expressions.
+> More information: <https://github.com/jpr5/ngrep>.
+
+- Capture traffic of all interfaces:
+
+`ngrep -d any`
+
+- Capture traffic of a specific interface:
+
+`ngrep -d {{eth0}}`
+
+- Capture traffic crossing port 22 of interface eth0:
+
+`ngrep -d {{eth0}} port {{22}}`
+
+- Capture traffic from or to a host:
+
+`ngrep host {{www.example.com}}`
+
+- Filter keyword 'User-Agent:' of interface eth0:
+
+`ngrep -d {{eth0}} '{{User-Agent:}}'`