查看uniq --help得到如下使用方法和参数：
Usage: uniq [OPTION]... [INPUT [OUTPUT]]
Filter adjacent matching lines from INPUT (or standard input),
writing to OUTPUT (or standard output).
With no options, matching lines are merged to the first occurrence.
Mandatory arguments to long options are mandatory for short options too.
-c, --count prefix lines by the number of occurrences
-d, --repeated only print duplicate lines, one for each group
-D, --all-repeated[=METHOD] print all duplicate lines
groups can be delimited with an empty line
METHOD={none(default),prepend,separate}
** -f, --skip-fields=N avoid comparing the first N fields**
--group[=METHOD] show all items, separating groups with an empty line
METHOD={separate(default),prepend,append,both}
-i, --ignore-case ignore differences in case when comparing
-s, --skip-chars=N avoid comparing the first N characters
-u, --unique only print unique lines
-z, --zero-terminated end lines with 0 byte, not newline
-w, --check-chars=N compare no more than N characters in lines
因为我的数据只需要根据前两列筛去重复项就可以出结果了，如果能用uniq会非常简单，但它似乎没有这个功能（只能跳过前几列），而我的数据字符数不保持相同，所以另外几个参数-w似乎也用不了，大家有什么办法么？
