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Delete lines containing a specific string with sed

The following command makes sed delete every lines containing the matching pattern from the file named foo. If this file is important, we make sure to back it up first!

$ sed -i '/pattern/d' /path/to/foo

The -i flag (GNU version only) edit the file in-place. For non-GNU version, we can redirect the output with >.

$ sed '/pattern/d' /path/to/foo > /path/to/foo

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