don’t forget

1. ln /source/dir linktarget -s

Symbolic link to directory

2. ⌘ + shift + 4 then space

Take a screenshot of the current window

3. rake -T

List available rake tasks

4. sudo dpkg-reconfigure tzdata

Change timezone on ubuntu

5. sudo netstat -ltnp | grep ':80'

Find apache blocking processes

6. du -h --max-depth=1

Summarised disk usage of top-level nodes

7. ssh -o TCPKeepAlive=no
       -o ServerAliveInterval=15 addr

SSH with keepalive signal every 15 minutes to prevent close