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What does ruby mean ?

I tried this out , sed "1,${line} d" log_filename

This leaves the log_filename as it is. I would have to
sed "1,${line} d" log_filename > log_filename.new
mv log_filename log_filename.old
mv...

I wish to delete lines from a log file. Should take a date string as a variable. Find the date in the file, get the line number for the string. Delete lines from 1 to that (line number - 1), all from...