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Query on executing awk using SSH

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# 1  
Old 07-18-2014
Query on executing awk using SSH
Hi All,

Im trying to find the count of process running on remote server using SSH.

Below command dosen't work.

Code:
ssh -q user@host "ps -ef | grep "pattern" | grep -v 'grep' | awk '{print $2}'|wc -l"

But below command works.

Code:
ssh -q user@host "ps -ef | grep "pattern" | grep -v 'grep' | awk '{print \$2}'|wc -l"

the difference between 2 commands is $ was eacaped in second command.

Can any one explain the concept why we should escape $.
# 2  
Old 07-18-2014
Because the command string is enclosed in double quotes and so the shell will try to expand variable $2, therefore the $-sign needs to be escaped..

There are two sections protected by double quotes:
Code:
"ps -ef | grep "

and
Code:
" | grep -v 'grep' | awk '{print \$2}'|wc -l"

To join them into one section protected by double quotes, you would need to also escape the double quotes within the double quotes.. ...grep \"pattern\"...
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