求助：shell截取文件中的一段怎么做。

niccn20

Dad loved to play the mandolin for his family he knew we enjoyed singing, and hearing him play. He was like that. If he could give pleasure to others, he would, especially his family. He was always there, sacrificing his time and efforts to see that his family had enough in their life. I had to mature into a man and have children of my own before I realized how much he had sacrificed.

　　I joined the United States Air Force in January of 1962. Whenever I would come home on leave, I would ask Dad to play the mandolin. Nobody played the mandolin like my father. He could touch your soul with the tones that came out of that old mandolin. He seemed to shine when he was playing. You could see his pride in his ability to play so well for his family.

　　When Dad was younger, he worked for his father on the farm. His father was a farmer and sharecropped a farm for the man who owned the property. In 1950, our family moved from the farm. Dad had gained employment at the local limestone quarry. When the quarry closed in August of 1957, he had to seek other employment.

比如这是a.txt文件内容，还有很多段我未贴出来，我现在需要截取字符串“in January of 1962.”到本段末的内容，即到回车行结束。然后再在截取的内容中查找是否有字符串“in China”.请问怎么做，详细讲解一下。谢谢高手们。

yestreenstars

1. grep 'in January of 1962\..*in China'

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niccn20

好像不对啊 大哥  其实可以看成是找前后都是回车符的段落，其中必须包含“in January of 1962”和“in china”两个字符串。

niccn20

还有文件名是a.txt

yestreenstars

回复 3# niccn20

你给的测试文本里根本没有in China这个字符串，所以没有结果。

按照你的要求，你需要的应该是：

1. awk '/in January of 1962/&&/in China/' a.txt

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niccn20

这样吧  awk '/in January of 1962/&&/You could see his pride/' a.txt 应该是有结果的 实际上没有

yestreenstars

回复 6# niccn20

我这里有结果，或许你需要先用dos2unix转化一下文本。

1. [root@localhost test]# awk '/in January of 1962/&&/You could see his pride/' a.txt
   
2. 　　I joined the United States Air Force in January of 1962. Whenever I would come home on leave, I would ask Dad to play the mandolin. Nobody played the mandolin like my father. He could touch your soul with the tones that came out of that old mandolin. He seemed to shine when he was playing. You could see his pride in his ability to play so well for his family.
   
3. [root@localhost test]# cat a.txt
   
4. Dad loved to play the mandolin for his family he knew we enjoyed singing, and hearing him play. He was like that. If he could give pleasure to others, he would, especially his family. He was always there, sacrificing his time and efforts to see that his family had enough in their life. I had to mature into a man and have children of my own before I realized how much he had sacrificed.
   
5. 
   
6. 　　I joined the United States Air Force in January of 1962. Whenever I would come home on leave, I would ask Dad to play the mandolin. Nobody played the mandolin like my father. He could touch your soul with the tones that came out of that old mandolin. He seemed to shine when he was playing. You could see his pride in his ability to play so well for his family.
   
7. 
   
8. 　　When Dad was younger, he worked for his father on the farm. His father was a farmer and sharecropped a farm for the man who owned the property. In 1950, our family moved from the farm. Dad had gained employment at the local limestone quarry. When the quarry closed in August of 1957, he had to seek other employment.
   
9. [root@localhost test]#

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niccn20

大哥  我这还是不行啊   我就想判断文本里是否有这样一段，里面含有a和b两个字符串的。前后都为回车符的为一段。

jason680

回复 1# niccn20

$ awk -vRS='' '/in January of 1962/&&/You could see his pride/{print NR":"$0}' a.txt
2:　　I joined the United States Air Force in January of 1962. Whenever I would come home on leave, I would ask Dad to play the mandolin. Nobody played the mandolin like my father. He could touch your soul with the tones that came out of that old mandolin. He seemed to shine when he was playing. You could see his pride in his ability to play so well for his family.

$ grep -n ".*" a.txt
1:Dad loved to play the mandolin for his family he knew we enjoyed singing, and hearing him play. He was like that. If he could give pleasure to others, he would, especially his family. He was always there, sacrificing his time and efforts to see that his family had enough in their life. I had to mature into a man and have children of my own before I realized how much he had sacrificed.
2:
3:　　I joined the United States Air Force in January of 1962. Whenever I would come home on leave, I would ask Dad to play the mandolin. Nobody played the mandolin like my father. He could touch your soul with the tones that came out of that old mandolin. He seemed to shine when he was playing. You could see his pride in his ability to play so well for his family.
4:
5:　　When Dad was younger, he worked for his father on the farm. His father was a farmer and sharecropped a farm for the man who owned the property. In 1950, our family moved from the farm. Dad had gained employment at the local limestone quarry. When the quarry closed in August of 1957, he had to seek other employment.


   

niccn20

谢谢大哥们。