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How to sum values from top


 
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# 1  
Old 10-13-2009
Question How to sum values from top

Hi.
Im looking for way to sum numbers from top. For example i have such command
Code:
top -b -n | grep Cpu | cut -c 35 - 39

which give me output 97.0 . Ho can i do with that value any arithmetic actions (for example 97.0 +1)?
Using
Code:
c = $((top -b -n | grep Cpu | cut -c 35 - 39))

gives me eof expression error...

Last edited by zaxxon; 10-13-2009 at 03:42 AM.. Reason: code tags
# 2  
Old 10-13-2009
When defining variables, don't leave spaces between the variable name the equal sign and the value. On my box top is missing a value for -n. Also when using a range with cut, leave spaces out too. You should work on the single commands first so that they work and then put them together.

Code:
c = $((top -b -n | grep Cpu | cut -c 35 - 39))
 ^ ^            ^                      ^ ^
 | |            |                      | |
Delete those..  |  ..spaces, they are wrong!
                |
       Missing a value here


Last edited by zaxxon; 10-13-2009 at 05:50 AM.. Reason: Note for missing value
# 3  
Old 10-13-2009
Code:
c=$((top -b -n 1| grep Cpu | cut -c 35-39))

gives the same error message...

Code:
arithmetic expression: expecting EOF: "top -b -n 1| grep Cpu | cut -c 35-39"


Last edited by zaxxon; 10-13-2009 at 08:06 AM.. Reason: code tags
# 4  
Old 10-13-2009
Hi,

Hope this will be helpful.

Code:
$ top -b -n 1| grep Cpu| cut  -c35-39
 83.7
$ echo `top -b -n 1| grep Cpu| cut  -c35-39` + 1| bc -l
84.7
$ echo `top -b -n 1| grep Cpu| cut  -c35-39` + 1| bc -l| read tvar
$ echo $tvar
84.7
$

# 5  
Old 10-13-2009
Put it into single brackets not double - you don't want any calculations there. $() is the same as ranjithpr wrote with ``.

Also start using [code] and [/code] when posting code, data or logs please.
# 6  
Old 10-13-2009
Code:
echo `top -b -n 1| grep Cpu| cut  -c35-39` + 1| bc -l| read tvar
echo $tvar

gives error message illegal character |

Code:
echo $( top -b -n 1| grep Cpu| cut  -c35-39 ) + 1| bc -l| read tvar
echo $tvar

works without error, but gives no output
# 7  
Old 10-13-2009
Stay with your original line:
Code:
c=$(top -b -n 1| grep Cpu | cut -c 35-39)
echo $c


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