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add a string to a file without line break

 
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# 8  
Old 10-26-2012
Change
Code:
ssh ${_user}@${_ip} "sudo /bin/sed -i '$s/$/ elevator=noop/' /home/wadhwaso/test "

to
Code:
ssh ${_user}@${_ip} 'sudo /bin/sed -i "\$s/\$/ elevator=noop/" /home/wadhwaso/test'

.
Single-quotes lose their ability of quoting when they are enclosed within double-quotes. So, your shell will still look within that string and expand $s to a null string even before ssh is executed.
Last edited by elixir_sinari; 10-26-2012 at 03:52 AM..
# 9  
Old 10-26-2012
Quote:
Originally Posted by elixir_sinari
Change
Code:
ssh ${_user}@${_ip} "sudo /bin/sed -i '$s/$/ elevator=noop/' /home/wadhwaso/test "

to
Code:
ssh ${_user}@${_ip} 'sudo /bin/sed -i "\$s/\$/ elevator=noop/" /home/wadhwaso/test'

.
Single-quotes lose their ability of quoting when they are enclosed within double-quotes. So, your shell will still look within that string and expand $s to a null string even before ssh is executed.
That worked, Thanks a lot Elixir ..

can you tell me one thing more, I want to add that string "elevator=noop" in /etc/grub.conf at the end of all the lines starting with "kernel", so i did:
Code:
ssh ${_user}@${_ip} 'sudo /bin/sed -i "/kernel/ \$s/\$/ elevator=noop/" /etc/grub.conf'

but its not working, it gave me following error:

HTML Code:
sed: -e expression #1, char 10: unknown command: `$'
# 10  
Old 10-26-2012
Quote:
Originally Posted by stunn3r
I want to add that string "elevator=noop" in /etc/grub.conf at the end of all the lines starting with "kernel",
Try

Code:
ssh ${_user}@${_ip} 'sudo /bin/sed  "s/kernel.*/& elevator=noop/" /etc/grub.conf'

This User Gave Thanks to pamu For This Post:
stunn3r
# 11  
Old 10-26-2012
Quote:
Originally Posted by pamu
Try

Code:
ssh ${_user}@${_ip} 'sudo /bin/sed  "s/kernel.*/& elevator=noop/" /etc/grub.conf'

Thanks, that worked Smilie .. just added "-i" .. Smilie

just one thing, it adds parameter "elevator=noop" to those lines too which are commented. Is it possible to add this parameter to only those lines which START with 'kernel', if a line start with "#" or something else, it should ignore that line ..
Last edited by stunn3r; 10-26-2012 at 05:13 AM..
# 12  
Old 10-26-2012
Code:
ssh ${_user}@${_ip} 'sudo /bin/sed  "s/^kernel.*/& elevator=noop/" /etc/grub.conf

This User Gave Thanks to elixir_sinari For This Post:
stunn3r
# 13  
Old 10-26-2012
Quote:
Originally Posted by elixir_sinari
Code:
ssh ${_user}@${_ip} 'sudo /bin/sed  "s/^kernel.*/& elevator=noop/" /etc/grub.conf

worked perfectly ..

but there are spaces before kernel .. its like " kernel ......" , and these spaces wont be constant for all the servers. any way to ignore these spaces ??
# 14  
Old 10-26-2012
Code:
ssh ${_user}@${_ip} 'sudo /bin/sed  "s/^[ <tab>]*kernel.*/& elevator=noop/" /etc/grub.conf

where <tab> should be replaced by pressing the Tab key.
This User Gave Thanks to elixir_sinari For This Post:
stunn3r
 
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