> sed -n 's/old/new/wfile.tmp' file This saves only lines which underwent substi... | Hacker News

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		jwilk on May 4, 2022 \| parent \| context \| favorite \| on: Bash-oneliner: A collection of handy Bash one-line... > sed -n 's/old/new/wfile.tmp' file This saves only lines which underwent substitution, which was probably not what you wanted.

1vuio0pswjnm7 on May 4, 2022 [–]

Missing semicolon.

  sed -n 's/old/new/;w file.tmp' file

Unlike BSD and GNU sed, it appears that Plan9 sed will append to instead of overwite file.tmp

It also requires a space after the w command.

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