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Retrieve RAM memory size from "top" command output

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# 1  
Old 02-07-2011
Retrieve RAM memory size from "top" command output
Hi,

I am trying to get the system RAM size from "top" command's output by the following but it is not working.

Code:
top | sed "s/^Mem.*[^0-9]*\([0-9]*\), *//"

Last edited by royalibrahim; 02-07-2011 at 09:31 AM..
# 2  
Old 02-07-2011
Post the output of your top command and the desired output.
# 3  
Old 02-07-2011
Code:
# top | awk '/^Mem/ {print $2}'
32G

(If Solaris. But why use top?)

Linux.
Code:
$ top -n1 | awk '/^Mem/ {print $3}'
1026880k

Last edited by Scott; 02-07-2011 at 09:53 AM..
# 4  
Old 02-08-2011
Quote:
Originally Posted by Franklin52
Post the output of your top command and the desired output.
The output is as follows:
Code:
top - 09:45:10 up 15:48,  1 user,  load average: 0.07, 0.02, 0.00
Tasks: 112 total,   1 running, 111 sleeping,   0 stopped,   0 zombie
Cpu(s):  0.0%us,  0.0%sy,  0.0%ni,100.0%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Mem:   1025740k total,  1012624k used,    13116k free,   428188k buffers
Swap:  3004112k total,    74580k used,  2929532k free,   134616k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
    1 root      20   0  2848 1688  544 S    0  0.2   0:02.12 init
    2 root      15  -5     0    0    0 S    0  0.0   0:00.00 kthreadd


Quote:
Originally Posted by scottn
Code:
# top | awk '/^Mem/ {print $2}'
32G

(If Solaris. But why use top?)

Linux.
Code:
$ top -n1 | awk '/^Mem/ {print $3}'
1026880k

Thanks Scottn, but is it possible to do it via 'sed'??
# 5  
Old 02-08-2011
Right tool for the right job and all that. You want to match a line and extract the third token? Well awk matches lines, and extracts tokens. You'd need to write a big monster of an expression to tell sed what you mean by 'token'.
# 6  
Old 02-08-2011
Quote:
Originally Posted by Corona688
Right tool for the right job and all that. You want to match a line and extract the third token? Well awk matches lines, and extracts tokens. You'd need to write a big monster of an expression to tell sed what you mean by 'token'.
But we can map any sequence of characters with '.*' right in Sed? Where I am going wrong in my code?
# 7  
Old 02-08-2011
Are you looking for an output like this.. Mem: 1025740k from the top command..?
Code:
top | sed -n '/Mem/s/ [a-z]\+.*//p'
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