CentOS - Mar 2011 - ssh remote execute awk problem

Hi , all :


There is a problem on executing awk command to remote servers;

The shell test script is like this :



   1. #!/bin/sh
   2.
   3. _CMD="ssh root at localhost"
   4.
   5. cpu_num="$($_CMD awk '/processor/{count["proc"]++};
END{print
   count["proc"]}' /proc/cpuinfo)?
   6.
   7. echo $cpu_num


My root account can entry the server without the passwd.

But  I found no result on the screen .

Is there some error on that script ? By the way , I googled and found use
the following method can run the right result .


   1. #!/bin/sh
   2.
   3. _CMD="ssh root at localhost"
   4.
   5. cpu_num="$($_CMD  << 'HERE'
   6. awk '/processor/{count["proc"]++}; END{print
count["proc"]}'
   /proc/cpuinfo
   7. HERE
   8.
   9. )?
   10.
   11. echo $cpu_num
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.centos.org/pipermail/centos/attachments/20110317/bedac8bf/attachment-0001.html>

From: sync <jiannma at gmail.com>
>There is a problem on executing awk command to remote servers;
>    1. #!/bin/sh
>    2. 
>    3. _CMD="ssh root at localhost"
>    4. 
>    5. cpu_num="$($_CMD awk
'/processor/{count["proc"]++}; END{print
>count["proc"]}' /proc/cpuinfo)?
>    6. 
>    7. echo $cpu_num
Quote the whole command and backslash the command quotes...
ssh root at localhost "awk '/processor/{count[\"proc\"]++};
END{print
count[\"proc\"] } ' /proc/cpuinfo"

JD