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Top Forums Shell Programming and Scripting Concatenate and sort to remove duplicates Post 303027526 by Don Cragun on Monday 17th of December 2018 02:49:25 PM
Old 12-17-2018
I partially agree with nezabudka, awk is the way to go here; but we need to make each block a record, not each line. By setting RS to an empty string, we can tell awk that records are separated by sequences of a <newline> followed by one or more blank lines. Given this fact, the following should work:
Code:
awk '
BEGIN {	RS = ""
}
!($0 in seen) {
	seen[$0]
	printf("%s%s\n", (NR == 1) ? "" : "\n", $0)
}' file

which will print the first occurrence of each duplicated record found in the file named file to its output. Note that the above code does not print an empty line before the 1st output record or after the last output record. The code could be simplified if you always want to print an empty line after each output record.

If you want to try this on a Solaris/SunOS system, change awk to /usr/xpg4/bin/awk or nawk.
 

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IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME
igawk - gawk with include files SYNOPSIS
igawk [ all gawk options ] -f program-file [ -- ] file ... igawk [ all gawk options ] [ -- ] program-text file ... DESCRIPTION
Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1). AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like @include getopt.awk in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path. OPTIONS
See gawk(1) for a full description of the AWK language and the options that gawk supports. EXAMPLES
cat << EOF > test.awk @include getopt.awk BEGIN { while (getopt(ARGC, ARGV, "am:q") != -1) ... } EOF igawk -f test.awk SEE ALSO
gawk(1) Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995. AUTHOR
Arnold Robbins (arnold@skeeve.com). Free Software Foundation Nov 3 1999 IGAWK(1)
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