Strange result of eval, how does eval really work with ssh? Post: 302519466

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Top Forums Shell Programming and Scripting Strange result of eval, how does eval really work with ssh? Post 302519466 by summer_cherry on Wednesday 4th of May 2011 05:22:54 AM

05-04-2011

Registered User

Strange result of eval, how does eval really work with ssh?

Hi all,

some small script with eval turned me to crazy.

my OS is linux

Code:

Linux s10-1310 2.6.16.53-0.8.PTF.434477.3.TDC.0-smp #1 SMP Fri Aug 31 06:07:27 PDT 2007 x86_64 x86_64 x86_64 GNU/Linux

below script works well

Code:

#!/bin/bash
eval ssh remotehost date
eval ssh remotehost ls

below script works also well

Code:

echo "ls
ls -l" | while read line;do
eval $line
done

then below script has issue that only first line of command got executed

Code:

echo "ssh remotehost date
ssh remotehost ls" | while read line;do
eval $line
done

i was thinking maybe eval break the loop, but below script do print out the "-----" line

Code:

echo "ssh remotehost date
ssh remotehost ls" | while read line;do
eval $line
echo "----"
done

so what wrong here, please kindly help.

Last edited by summer_cherry; 05-04-2011 at 06:26 AM.. Reason: wrong title

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