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Top Forums UNIX for Advanced & Expert Users Alternative to sort -ur +1 required Post 302712379 by Mike Smith on Tuesday 9th of October 2012 06:19:23 AM
Old 10-09-2012
Tried -k2,2 and it binned loads of old entries which I wanted!

Say I have this data, the highest number (newest) one will always be at the top and I only want to keep the top one as everything right of, and including, column 2 is the same (nothing has changed since last sweep).
1349455502 ygtr-1b:3/1/19 10/100/Gig Ethernet SFP
1349246545 ygtr-1b:3/1/19 10/100/Gig Ethernet SFP

However if we get the following then I want both entries retaining
1349455502 ygtr-1b:3/1/19 10/100/Gig Ethernet SFP
1349246545 ygtr-1b:3/1/19 Old customer name typed in here

-k2,2 seems to ONLY consider column 2 which is no good based on my first post's criteria.

This is tricky!
 

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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)
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