Shulou(Shulou.com)06/03 Report--

Because the sentence sed is printed intact in shell, it turns out to be a strange phenomenon that sed does not take effect after shell is run, but it is found that it can be passed by copying and pasting commands when running shell.

If you use sed in shell, if you have a special character like $, you have to replace single quotation marks with double quotation marks.

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