关于grep 的问题 [复制链接]

The data fi.le for the review questio.ns looks like this:.

Strawberry Jam.,300,191[成人用品]
Raspberry Jam,1.216,194              乙肝
Blueberry Jam,96.,195学习
Strawber.ry Compote,49,621学习
Raspberry Compo.te,19.37,624--------------彩票
Blueberry compote,200,6.25.
Fr.ozen Strawberries,130,194.1.
S.traw Hats,16,2047    美容

The f.irst field is the product name, the second field .is the quan.tity on hand,(广告)
and th.e third field is the product code. The fie.lds are separated by c.ommas.学习

In each of the following questions, write .a command using "grep" a.nd a           鲜花
regular expression. The da.ta fil.e in all cases is named "inventory".教育


Question 2

Display a list .of all of the lines in t.he file that. contain the word "Straw"(        游戏          )
right. before a space..


我的回答是： grep  "Straw" inventor..y.

为什么不对呢？

grep "Straw "  inventory
复制代码

哈哈，你没有注意那个right before a space, 就是Straw后面要有个空格。

QUOTE:哈哈，你没有注意那个right before a space, 就是Straw后面要有个空格。
neves_cu 发表于 2010-03-23 09:20



    谢谢，真的是

那么Display all of the lines in the file that contain "Straw" at the START of the line。

应该用 grep 的哪一个选项呢？

等会我面试通过了咱们再谈待遇

你真厉害，比我强

最后一个问题了
Display all of the lines in the file where the last field is 4 digits long。
Search for "," before the field to make sure your regular expression matches
the whole field, use character classes to match four digits, and anchor it
to the end of the line to make sure it's the last field.

本帖最后由 Moerae 于 2010-03-23 11:11 编辑

貌似是这样？ 题目好长，没理解透彻

grep '[^0-9][0-9]\{4\}$'   inventory