Sort references Post: 302903997

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Top Forums UNIX for Dummies Questions & Answers Sort references Post 302903997 by Don Cragun on Saturday 31st of May 2014 11:40:25 PM

06-01-2014

Registered User

With well over 800 posts in these forums and the code you have been given, I am disappointed that you could not add reference numbers on your own. Try this minor modification to clx's awk script:

Code:

#!/bin/ksh
# Usage: sortrefs [starting_sequence_number [input_file]]
# Sort references found in the given input_file (default ref.txt) and add
# sequences numbers starting with starting_sequence_number (default 1).
awk '
{	gsub(/\n/,"\1");
	print $0 "\1"
}' RS='' "${2:-ref.txt}" | sort | awk -v sseq="${1:-1}" '
{	gsub(/\1/, "\n")
	printf("[%d] %s\n", sseq++, $0)
}'

As always, if you want to try this on a Solaris/SunOS system, change awk (in both places where it is used in this script) to /usr/xpg4/bin/awk, /usr/xpg6/bin/awk, or nawk.

I use the Korn shell, but this script can use, ksh, bash, or any other shell that supports POSIX required variable expansions. If you save the above script in a file names sortrefs, make it executable, and invoke it as:

Code:

./sortrefs 44

when ref.txt contains your sample input, the output produced is:

Code:

[44] Anderson, E.R., Duvall, T.L., Jr., and Jefferies, S.M., 1990. Modelling 
     of Solar Oscilation Power Spectra. The Astrophysical Journal, vol. 364, 
     p. 699.

[45] Basu, S., Antia, H.M., and Tripathy, S.C. 1999. Ring Diagram Analysis
     of Near-Surface Flow in the Sun. The Astrophysical Journal, vol. 512, 
     pp. 458-470.

[46] Duvall, T.L., Jr., and Harvey, J.W., 1986. Solar Doppler Shifts: Sources 
     of Continuous Spectra. In Seismology of the Sun and the Distant Stars, 
     (ed. D. Gough), NATO A Ser., Reidel, Dordrecht, p. 105.

[47] Nigam, R., Kosovichev, A.G., Scherrer, P.H., and Schou, J., 1998. 
     Asymmetry in Velocity and Intensity Helioseismic Spectra: A solution 
     to a long-standing puzzle. The Astrophysical Journal, vol. 495, 
     pp. L115-L118.

Don Cragun

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igawk

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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