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I use the following sed command to remove the line number string from file
sed -i s'/line number//g' file
but what I need to change in sed syntax in order to remove the line number
only if it exist in the last line of the file?
I’m not sure I fully understand your question, however this can help you :
This will perform substitution only on last line (because of
$), replacingline numberby nothing.man sed, section Addresses can help you understand how to apply sed commands on part of the text.