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原文链接：https://www.f2er.com/bash/391485.htmlCTRL-^
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If there already was a current file name,then that one becomes the alternate file name. It can be used with “#” on the command line |:_#| and you can use the |CTRL-^| command to toggle between the current and the alternate file. However,the alternate file name is not changed when |:keepalt| is used. An alternate file name is remembered for each window.
