A bunch of new pages:

common/: dig, gzip, rm, sort, zfs, zpool
linux/: apt-get, shutdown
osx/: airport, caffeinate, diskutil, networksetup open, pgrep, qlmanage, say, shutdown, sysctl, system_profiler

Edits to existing pages:
curl: Added simple download example
find: Added iname and size exmaples
grep: Edited -c description
ps: Added wide lines example
ssh: edited -D description, added simple port forwarding example
unzip: added list option

common/ssh.md

@@ -11,6 +11,10 @@
 
 `ssh {{username}}@{{remote_host}} -P {{2222}}`
 
-- ssh tunneling
+- ssh tunneling: dynamic port forwarding (SOCKS proxy on localhost:9999) 
 
 `ssh -D {{9999}} -C {{username}}@{{remote_host}}`
+
+- ssh tunneling: forward a specific port (localhost:9999 to slashdot.org:80)
+
+`ssh -L {{9999}}:slashdot.org:80 {{username}}@{{remote_host}}`