管道式编程 查找，排序等

读取Sep-2013下面的所有log文件，并扔进管道
cat /home/hadoop/Sep-2013/*/* | python ipmappper.py | sort | python ipreducer.py


vim 1.txt
dong xi cheng
xi dong cheng
wo ai beijing
tian an men
qiche
dong
dong
dong

cat 1.txt | grep "dong" | sort
dong
dong
dong
dong xi cheng
xi dong cheng



vim sort.txt
0
2
1
9
5
4
8
7
5

sort sort.txt | uniq -c
      1 0
      1 1
      1 2
      1 4
      2 5
      1 7
      1 8
      1 9




或者
cat 1.txt | python grep.py | java sort.jar