今晚的课从2.4讲到2.6.看老师做很好懂,自己敲就好慢(打字慢),还老是报错。原来没看清楚就输入,得仔细认真!比如:tr [a-z] [A-Z] 敲成tr [ a-z ] [ A-Z ] ,好几遍才发现问题! 相关文章: 2021-08-12 2021-05-11 2021-12-23 2021-10-15 2021-12-07 2021-12-14 2021-10-29 2021-08-12