Display available ram memory in Terminal (no top) and WiFi info

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Level 1

1 points

Display available ram memory in Terminal (no top) and WiFi info

I am searching for something similar to "free" in Linux, to display the amount of free and used memory, and then incapsulate it into a shell script, so "top" isn't good.
I already found the total memory output with "system_profiler SPHardwareDataType | grep Memory | awk '{print $2}" but I can't find any way to display the unused+free memory.

Furthermore I need the output of the total received and sent bytes trough a wlan device.
In Linux, for example, I used "/sbin/ifconfig eth0 | grep 'RX byte' | awk '{print $3 $4}'" but here ifconfig foo doesn't display any info about amount of data received/sent by a device.

Ibook 12'' 1.33ghz and MBP 15'' 2.2ghz, Mac OS X (10.4.11), The MBP that often skipped random letter swhen typing :(

Posted on Jul 15, 2008 6:55 AM

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Answer 1

Camelot

Level 9

59,807 points

Jul 15, 2008 9:43 AM in response to flapane

I am searching for something similar to "free" in Linux, to display the amount of free and used memory, and then incapsulate it into a shell script, so "top" isn't good.

What's wrong with 'top'?

top -l 1 | grep PhysMem

Furthermore I need the output of the total received and sent bytes trough a wlan device.

You should be able to parse the results from:

netstat -i

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Answer 2

flapane Author

Level 1

1 points

Jul 15, 2008 11:04 AM in response to Camelot

Thank you! I didn't know I could parse an output from top because I didn't know the -l argument.
I did this and it worked, maybe it can helps someone:

inact=`top -l 1 | grep PhysMem | awk '{print $6}' | sed -e 's/M.*//'`
free=`top -l 1 | grep PhysMem | awk '{print $10}' | sed -e 's/M.*//'`
i=`echo "$inact+$free" | bc`

For netstat, I can see i/o packets, how to... translate them into Bytes?
thanks

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Answer 3

BobHarris

Level 9

57,331 points

Jul 15, 2008 2:45 PM in response to flapane

I am searching for something similar to "free" in Linux, to display the amount of free and used memory

You could try


/usr/bin/vm_stat | grep 'Pages free'

I'm just unsure if this is part of XCode developer tools installation or if it is there by default

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Answer 4

Camelot

Level 9

59,807 points

Jul 15, 2008 3:02 PM in response to flapane

For netstat, I can see i/o packets, how to... translate them into Bytes?

You're right - the default output of netstat is packets. Use the -b switch to get bytes:

<pre class=command>netstat -ib</pre>

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Answer 5

flapane Author

Level 1

1 points

Jul 16, 2008 2:47 AM in response to Camelot

It did the trick, thank you.
Another time I post the code that could helps somebody.

g=`netstat -ib | grep en1 | awk '{print $7}' | sed 1q`
h=`netstat -ib | grep en1 | awk '{print $10}' | sed 1q`
mbytesin=`expr $g \/ 1024000`
mbytesout=`expr $h \/ 1024000`

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