下面是我简化过一个例子，多行处理的比较难

tyguaike

这下面用一个更简单的安例：

只用当前行NR和上面两行NR－1，NR－2比较
A B
B C
B B
C C
A C
A A
A C

输出结果:
A B
B C
B B NotFound ＃上面两行是AB BC
C C NotFound ＃上面两行是BB BC
C C Found    # 上面两行是BB CC，这里出现了CC
A C NotFound  ＃上面两行是CC CC，没出现AC
A A NotFound  ＃上面两行是 CC AC
A C Found     ＃上面两行是AC AA，这里出现了一个AC

xuqq999

1. awk '{if(NR>=3){a[NR]=$0;if((a[NR]==a[NR-1])||(a[NR]==a[NR-2])){print a[NR]" Found"}else{print a[NR]" Not Found"}}else{a[NR]=$0;print a[NR]}}' filename

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greysky-zfj

回复 1# tyguaike

1. awk '{s[NR]=$0} {if(s[NR-1]==$0||s[NR-2]==$0) print $0" Fond"; else print $0" NotFond"}'

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dn833

回复 2# xuqq999


    最后else就前2行，，，没必要a[NR]=$0;print a[NR]，就直接print $0就行了吧

hujysh

回复 1# tyguaike


    你还是看原贴吧，7楼 我写了答案了。

smallpboy

1. awk '{if(NR>2){if($0==a[0] || $0==a[1])print $0,"FOUND";else print $0,"NOT FOUND";}else print $0;a[NR%2]=$0}'

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yestreenstars

回复 3# greysky-zfj


    我想你自己应该没运行过吧，你这条命令不对。

yestreenstars

1. awk 'NR<3{a[NR]=$0;print a[NR];next}{if($0==a[NR-2] || $0==a[NR-1])print $0" Found";else print $0" NotFound";a[NR]=$0}' urfile

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yestreenstars

回复 4# dn833


    不行的，一定要执行a[NR]=$0，不然的话就没有a[1]和a[2]了。

dn833

回复 9# yestreenstars

1. [root@cloud tmp]# awk '{if(NR>=3){a[NR]=$0;if((a[NR]==a[NR-1])||(a[NR]==a[NR-2])){print a[NR]" Found"}else{print a[NR]" Not Found"}}else{a[NR]=$0;print a[NR]}}' file
   
2. A B
   
3. B C
   
4. B B Not Found
   
5. C C Not Found
   
6. A C Not Found
   
7. A A Not Found
   
8. A C Found
   
9. [root@cloud tmp]# awk '{if(NR>=3){a[NR]=$0;if((a[NR]==a[NR-1])||(a[NR]==a[NR-2])){print a[NR]" Found"}else{print a[NR]" Not Found"}}else{print $0}}' file
   
10. A B
    
11. B C
    
12. B B Not Found
    
13. C C Not Found
    
14. A C Not Found
    
15. A A Not Found
    
16. A C Found

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这俩有啥区别？？？