使用命令 $KCODE="utf8"
如
irb(main):003:0> "你好" => "\344\275\240\345\245\275" irb(main):004:0> $KCODE="utf8" => "utf8" irb(main):005:0> "你好" => "你好"
irb(main):003:0> "你好" => "\344\275\240\345\245\275" irb(main):004:0> $KCODE="utf8" => "utf8" irb(main):005:0> "你好" => "你好"