Variable value in ssh

Shell Programming and Scripting
1

Hi,
I'm creating a script where I connet to a remote machine, I execute a command (I get a pid of an application) and I kill the application.
I wrote this:

ssh $HOST_WHITEBOARD<<END

COMMAND_GET_PID_WHITE="ps aux | grep something | awk '/Sl+/ {print \$2}' | awk 'begin {row=0} row==0 {print; row++} row>0 {next}'"


echo "Command to execute: $COMMAND_GET_PID_WHITE"


echo "Try to take il PID"

PID=`eval $COMMAND_GET_PID_WHITE`

echo "Pid: $PID"

kill -9 $PID

END

I have the problem in these lines:

COMMAND_GET_PID_WHITE="ps aux | grep something | awk '/Sl+/ {print \$2}' | awk 'begin {row=0} row==0 {print; row++} row>0 {next}'"

echo "Command to execute: $COMMAND_GET_PID_WHITE"

the echo of COMMAND_GET_PID_WHITE is an empty string. Why? How can I solve?
Thanks, bye bye.

2

can't you use pgrep ?

3

What happens when you put double quotes around END ?

ssh $HOST_WHITEBOARD<<"END"
4

Thanks a lot!
With:

ssh $HOST_WHITEBOARD<<"END"
it works!

Why do I have to put "?
Thanks again.
Bye bye.

5

Hi abdujaparov,

From man sh:

       <<[-]word     The  shell input is read up to a line that is the same as
		     word after any quoting has been removed, or to an end-of-
		     file.  No	parameter  substitution, command substitution,
		     arithmetic substitution or file name generation  is  per-
		     formed  on  word.	The resulting document, called a here-
		     document, becomes the standard input. If any character of
		     word is quoted, then no interpretation is placed upon the
		     characters of the document. Otherwise,  parameter	expan-
		     sion,  command  substitution, and arithmetic substitution
		     occur, \NEWLINE is ignored, and \ must be used  to  quote
		     the  characters \, $, `.

S.