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Rather than moving the file, cat the tmp file back onto the original file:


sed 's/foo/bar/' <ofile >tfile
cat tfile >ofile

Use ed:
printf '1,90d\nw\nq\n' | ed -s test.bak
... or, alternatively, with a heredoc ...
ed -s test.bak <<EOED
1,90d
w
q
EOED

Example:
$ jot 100 > data
$ ls -i data
5490111 data
$ wc...