Replace first occurrence per line

bash

sed 's/foo/bar/' file.txt

Explanation

By default, sed replaces only the first match on each line.

Learn the surrounding workflow

Compare similar commands or jump into common fixes when this command is part of a bigger troubleshooting path.

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Substitute every match on each line.

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Modify the original file directly.

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Create a backup copy while editing.

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Make path replacements easier to read.

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Remove empty lines from output.

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Skip lines that begin with `#`.

Open In sheetbash1 tag match