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# !/bin/sh 

file='test.txt' 

sort -n $file | uniq 

sort -n $file | awk '{if($0!=line)print; line=$0}' 

sort -n $file | sed '$!N; /^\(.*\)\n\1$/!P; D' 

测试文件：

yanggang@barry$ cat test.txt

aaa

bbbbb

ccccc

123

aaaaa

123

bbb

aaa

执行结果：

yanggang@barry$ ./diffRow.sh

aaa

aaaaa

bbb

bbbbb

ccccc

123