Problem with SSH
 

Hi,
I have written a script file that first makes a ssh connection with the remote system and then does some job. My script file is as follows

#! /bin/sh

ssh 172.16.1.2 <<EOF

sa=`/usr/sbin/alternatives --config java </root/Desktop/1.txt 2>&1 | grep jdk1.6.0_05`

echo $sa

sa2=`echo $sa | sed -e 's/[^0-9]//g'`

sa3=`echo $sa2 | head -c 1 >/root/Desktop/2.txt` 

echo @sa3

echo "end"

EOF

The ssh connection is formed successfully. But sa is not printing anything. just a blank line
similarly sa3. But end is being printed. Both text files (1.txt and 2.txt)resides in the remote system. I know the problem is with this line

sa=`/usr/sbin/alternatives --config java </root/Desktop/1.txt 2>&1 | grep jdk1.6.0_05`

The command is not taking input from 1.txt which is residing on the remote system. Where am i going wrong.

Re: Problem with SSH
 

At the moment you are throwing away the output from running /etc/sbin/alternatives because it gets filtered through grep before you print the value of $sa.

Try:

#! /bin/sh

ssh 172.16.1.2 <<EOF

   sa=`/usr/sbin/alternatives --config java 2>&1`

   echo "Result:"

   echo "$sa"

   echo

   echo "Will I find anything when I look in that result for jdk1.6.0_05 ???"

   echo "$sa" | grep "jdk1.6.0_05"

   echo "Nope. I thought not! But the reason should be clear now!"

EOF