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並前往https://serverfault.com/questions/135507/linux-how-to-use-a-file-as-input-and-output-at-the-same-time

Linux: How to use a file as input and output at the same time?

This allows for constructing pipelines that read from and write to the same file. To apply this to your problem, try: uniq .bash_history | sponge .bash_history.

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