Editing last line of a file


 
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# 1  
Old 02-28-2008
Editing last line of a file

Hi All,

Could you please help me out with this problem?

I need to edit the last line of my file.
Ex: The last line in my file will be say 000056000045 8

I need to subtract some number from the number 45 and replace the new number in its place.

Thank you all in advance.
# 2  
Old 02-28-2008
For example, substitute 45 with 99:

Code:
sed -i "\$s/\(.*\)..\( .\)$/\199\2/" input_file

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