Look up your Mac's Wi-Fi network name (SSID) on the command line

Information can be obtained with the command airport, which is somehow deep.

$ /System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport -I
     agrCtlRSSI: xxx
     agrExtRSSI: xxx
    agrCtlNoise: xxx
    agrExtNoise: xxx
          state: xxx
        op mode: xxx
     lastTxRate: xxx
        maxRate: xxx
lastAssocStatus: xxx
    802.11 auth: xxx
      link auth: xxx
          BSSID: xxx
           SSID: HERE!!!
            MCS: xxx
        channel: xxx

Pull out only where you want it

Shell is like this

$ /System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport -I | grep " SSID" | tr -d " " | cut -c6-
HERE!!!

Python is like this

import commands

airport = "/System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport -I"

print [line for line in commands.getoutput(airport).split('\n') if " SSID" in line][0].split(':')[1].strip()

# HERE!!!

For example, I made a command line tool that I can use at home and at work, but I have to set a proxy at work.