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(not flag) and '+s ' or flag
表达的意思是如果 flag 不是空字符串就取 flag 否则取 '+s',那可以写成 flag or '+s';(fzf and fzf or 'fzf')
里面的 fzf and fzf 应该直接简为 fzf;--tac
和+s
后面的空格删掉没有错误,后面的语句都添加了足够的空格。