02-24-2016
Hi ks_reddy,
Assuming that the Check values in your input are all numeric values, I note that RudiC's code will sort the header from your input file to the end of your output file. And by using the 2nd field as the primary sort key, the output will be grouped by (alphanumeric; not numeric) Check values while your input seems to be grouped by Key values.
Does your real input have all lines for each distinct Key value grouped together?
Do you want the header line in the output file? If so, does the header need to be kept as the first line in the output?
Does the order of other lines in the output matter? If so, does the input order need to be maintained in the output? Or is a different sort order required (and, if so, what order)?
Approximately how many distinct Key values are there in your real input? Approximately how many of those Key values will need to be removed?
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SORT(1) General Commands Manual SORT(1)
NAME
sort - sort a file of ASCII lines
SYNOPSIS
sort [-bcdfimnru] [-tc] [-o name] [+pos1] [-pos2] file ...
OPTIONS
-b Skip leading blanks when making comparisons
-c Check to see if a file is sorted
-d Dictionary order: ignore punctuation
-f Fold upper case onto lower case
-i Ignore nonASCII characters
-m Merge presorted files
-n Numeric sort order
-o Next argument is output file
-r Reverse the sort order
-t Following character is field separator
-u Unique mode (delete duplicate lines)
EXAMPLES
sort -nr file # Sort keys numerically, reversed
sort +2 -4 file # Sort using fields 2 and 3 as key
sort +2 -t: -o out # Field separator is :
sort +.3 -.6 # Characters 3 through 5 form the key
DESCRIPTION
Sort sorts one or more files. If no files are specified, stdin is sorted. Output is written on standard output, unless -o is specified.
The options +pos1 -pos2 use only fields pos1 up to but not including pos2 as the sort key, where a field is a string of characters delim-
ited by spaces and tabs, unless a different field delimiter is specified with -t. Both pos1 and pos2 have the form m.n where m tells the
number of fields and n tells the number of characters. Either m or n may be omitted.
SEE ALSO
comm(1), grep(1), uniq(1).
SORT(1)