As @khedron says, you can see this info in Activity Monitor.
If you want it on the command line, here is a Python script that I wrote (or perhaps modified from someone else's, I can't remember, it's quite old now) to show you the Wired, Active, Inactive and Free memory amounts:
#!/usr/bin/python
import subprocess
import re
# Get process info
ps = subprocess.Popen(['ps', '-caxm', '-orss,comm'], stdout=subprocess.PIPE).communicate()[0].decode()
vm = subprocess.Popen(['vm_stat'], stdout=subprocess.PIPE).communicate()[0].decode()
# Iterate processes
processLines = ps.split('\n')
sep = re.compile('[\s]+')
rssTotal = 0 # kB
for row in range(1,len(processLines)):
rowText = processLines[row].strip()
rowElements = sep.split(rowText)
try:
rss = float(rowElements[0]) * 1024
except:
rss = 0 # ignore...
rssTotal += rss
# Process vm_stat
vmLines = vm.split('\n')
sep = re.compile(':[\s]+')
vmStats = {}
for row in range(1,len(vmLines)-2):
rowText = vmLines[row].strip()
rowElements = sep.split(rowText)
vmStats[(rowElements[0])] = int(rowElements[1].strip('\.')) * 4096
print 'Wired Memory:\t\t%d MB' % ( vmStats["Pages wired down"]/1024/1024 )
print('Active Memory:\t\t%d MB' % ( vmStats["Pages active"]/1024/1024 ))
print('Inactive Memory:\t%d MB' % ( vmStats["Pages inactive"]/1024/1024 ))
print('Free Memory:\t\t%d MB' % ( vmStats["Pages free"]/1024/1024 ))
print('Real Mem Total (ps):\t%.3f MB' % ( rssTotal/1024/1024 ))
As you can see, you can just call vm_stat
from the command line, though it counts in 4kB pages, hence the script to convert to MB.
The script also counts up the "real memory" usage of all running processes for comparison (this won't match any specific value(s) from overall memory stats, because memory is a complex beast).
Here's an example of the output of the script on my system:
[user@host:~] % memReport.py
Wired Memory: 1381 MB
Active Memory: 3053 MB
Inactive Memory: 727 MB
Free Memory: 1619 MB
Real Mem Total (ps): 3402.828 MB
(very slightly adjusted to match the tab sizing on StackExchange ;)
You can install the pstree
command using either Homebrew (my personal favourite), MacPorts or Fink and you'll get a command-line, tree view of processes on your Mac.
With Homebrew installed, just run:
brew install pstree
then use it like pstree
from the command line.
Best Answer
ifconfig
gives information about all interfaces, including WLAN. The WLAN interface is usuallyen1
.airport -I
gives information about WLAN interfaces (check out the man page for additional options)