This will remove the non ascii characters,also creates backup file in file.backup file.
You can do the job with a perl one liner:
perl -i.backup -pe 's/[[:^ascii:]]//g;' file
Also,
$str =~ s/[^!-~\s]//g;
In the above, !-~ is a range which matches all characters between ! and ~. The range is set between ! and ~ because these are the first and last characters in the ASCII table.This does not include whitespace, so i added \s also.
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