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Full Discussion: Sort complicated two fields
Top Forums Shell Programming and Scripting Sort complicated two fields Post 302186535 by lalelle on Thursday 17th of April 2008 12:51:24 PM
Old 04-17-2008
Sort complicated two fields

Hi experts,

I am trying sort command with my data but still not getting the expected results.

For example, I have 5 fields data here

c,18:12:45,c,c,c
d,12:34:34,d,d,d
a,13:50:10,a,a,a
b,13:50:50,b,b,b
a,13:50:50,a,a,a
b,14:10:01,b,b,b
c,10:12:45,c,c,c


I want to get

a,13:50:50,a,a,a
b,14:10:01,b,b,b
c,18:12:45,c,c,c
d,12:34:34,d,d,d


I want to sort on the fifth field and sort reversely on the second field; getting the unique data of the fifth field; the unique record should be the lastest time(second field).

sort -r -t"," -k2,2 filename |sort -u -t"," -k5 >result
However, the result shows
a,13:50:10,a,a,a
b,13:50:50,b,b,b
c,10:12:45,c,c,c
d,12:34:34,d,d,d


Please help
 

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SORT(1) 							   User Commands							   SORT(1)

NAME
sort - sort lines of text files SYNOPSIS
sort [OPTION]... [FILE]... DESCRIPTION
Write sorted concatenation of all FILE(s) to standard output. Ordering options: Mandatory arguments to long options are mandatory for short options too. -b, --ignore-leading-blanks ignore leading blanks -d, --dictionary-order consider only blanks and alphanumeric characters -f, --ignore-case fold lower case to upper case characters -g, --general-numeric-sort compare according to general numerical value -i, --ignore-nonprinting consider only printable characters -M, --month-sort compare (unknown) < `JAN' < ... < `DEC' -n, --numeric-sort compare according to string numerical value -r, --reverse reverse the result of comparisons Other options: -c, --check check whether input is sorted; do not sort -k, --key=POS1[,POS2] start a key at POS1, end it at POS 2 (origin 1) -m, --merge merge already sorted files; do not sort -o, --output=FILE write result to FILE instead of standard output -s, --stable stabilize sort by disabling last-resort comparison -S, --buffer-size=SIZE use SIZE for main memory buffer -t, --field-separator=SEP use SEP instead of non- to whitespace transition -T, --temporary-directory=DIR use DIR for temporaries, not $TMPDIR or /tmp multiple options specify multiple directories -u, --unique with -c: check for strict ordering otherwise: output only the first of an equal run -z, --zero-terminated end lines with 0 byte, not newline --help display this help and exit --version output version information and exit POS is F[.C][OPTS], where F is the field number and C the character position in the field. OPTS is one or more single-letter ordering options, which override global ordering options for that key. If no key is given, use the entire line as the key. SIZE may be followed by the following multiplicative suffixes: % 1% of memory, b 1, K 1024 (default), and so on for M, G, T, P, E, Z, Y. With no FILE, or when FILE is -, read standard input. *** WARNING *** The locale specified by the environment affects sort order. Set LC_ALL=C to get the traditional sort order that uses native byte values. AUTHOR
Written by Mike Haertel and Paul Eggert. REPORTING BUGS
Report bugs to <bug-coreutils@gnu.org>. COPYRIGHT
Copyright (C) 2002 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU- LAR PURPOSE. SEE ALSO
The full documentation for sort is maintained as a Texinfo manual. If the info and sort programs are properly installed at your site, the command info sort should give you access to the complete manual. sort (coreutils) 4.5.3 October 2002 SORT(1)
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