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Top Forums Shell Programming and Scripting Remove Duplicates on multiple Key Columns and get the Latest Record from Date/Time Column Post 302799171 by Don Cragun on Friday 26th of April 2013 01:01:17 AM
Old 04-26-2013
Quote:
Originally Posted by vijaykodukula
Hi Don,

We have multiple files .Each file has different layout and has its own awk command to identify the fields for the Key columns.This is one sample.

Advance thanks a lot for the help.

we are using this for one of the sample file.

sort -r -t'|' -k1 "sample.txt"|awk '!x[$2,$4,$5]++' FS='|'|sort -t'|' -k2

Regards
Hi,
Please use CODE tags (rather than the color blue) to display sample input, output, and code.

You didn't really answer my questions. If you're trying to get a single script that can handle any of your files, how will that script know which fields need to be used to select entries, which field will be used to select the latest entry, and which field should be used to sort the output?

Is it always fields with the headers CDC_FLAG and SRC_PMTN_I as keys, always the field with the header CDC_PRCS_TS to select a line out of all lines with matching keys, and always sort the output with CDC_SEQ_I as the primary sort key and CDC_PRCS_TS as the secondary sort key?

Do you have a file that contains filenames that will be processed and the associated field numbers (or names) from which the above data can be extracted by the script?

The sample input file you showed is not sorted in the order that you said should be the output sort order. It seems to be sorted with field 5 as the primary sort key and field 1 as the secondary sort key, not field 2 as the primary sort key. Is this a mistake in your specification or is the script supposed to reorder the output as well as eliminate duplicates?
 

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SORT(1) 							   User Commands							   SORT(1)

NAME
sort - sort lines of text files SYNOPSIS
sort [OPTION]... [FILE]... sort [OPTION]... --files0-from=F DESCRIPTION
Write sorted concatenation of all FILE(s) to standard output. Mandatory arguments to long options are mandatory for short options too. Ordering options: -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' -h, --human-numeric-sort compare human readable numbers (e.g., 2K 1G) -n, --numeric-sort compare according to string numerical value -R, --random-sort sort by random hash of keys --random-source=FILE get random bytes from FILE -r, --reverse reverse the result of comparisons --sort=WORD sort according to WORD: general-numeric -g, human-numeric -h, month -M, numeric -n, random -R, version -V -V, --version-sort natural sort of (version) numbers within text Other options: --batch-size=NMERGE merge at most NMERGE inputs at once; for more use temp files -c, --check, --check=diagnose-first check for sorted input; do not sort -C, --check=quiet, --check=silent like -c, but do not report first bad line --compress-program=PROG compress temporaries with PROG; decompress them with PROG -d --files0-from=F read input from the files specified by NUL-terminated names in file F; If F is - then read names from standard input -k, --key=POS1[,POS2] start a key at POS1 (origin 1), end it at POS2 (default end of line) -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-blank to blank 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; without -c, 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; both are origin 1. If neither -t nor -b is in effect, characters in a field are counted from the beginning of the preceding whitespace. 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 sort bugs to bug-coreutils@gnu.org GNU coreutils home page: <http://www.gnu.org/software/coreutils/> General help using GNU software: <http://www.gnu.org/gethelp/> Report sort translation bugs to <http://translationproject.org/team/> COPYRIGHT
Copyright (C) 2010 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. 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 coreutils 'sort invocation' should give you access to the complete manual. GNU coreutils 8.5 February 2011 SORT(1)
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