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#!/usr/bin/mawk -We
# *********************************************************************
# Written by and copyright Carlo Strozzi <carlos@linux.it>.
#
# unique: make a table unique on the key field.
# Copyright (C) 2001 Carlo Strozzi <carlos@linux.it>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#
# 2001-03-26 Alpha Code
# 2001-04-18 Added inline help
# 2001-08-17 Added stdio portability
#
# $Id$
# *********************************************************************
BEGIN {
NULL = ""; FS = OFS = "\t"
while (ARGV[++i] != NULL) {
if (ARGV[i] == "-i" || ARGV[i] == "--input") i_file = ARGV[++i]
else if (ARGV[i] == "-o" || ARGV[i] == "--output") o_file = ARGV[++i]
else if (ARGV[i] == "-l" || ARGV[i] == "--last") last = 1
else if (ARGV[i] == "-N" || ARGV[i] == "--no-header") no_hdr = 1
else if (ARGV[i] == "-h" || ARGV[i] == "--help") {
system("grep -v '^#' @DOCPATH@/unique.txt")
rc = 1
exit(rc)
}
}
ARGC = 1 # Fix argv[]
if (o_file == NULL) o_file = "@STDOUT@"
if (i_file != NULL) { ARGV[1] = i_file; ARGC = 2 }
}
#
# Main loop
#
NR < 3 {
if (!no_hdr) print > o_file
next
}
#
# Next code loads the input table entirely into memory, so be warned.
#
NR > 2 {
if (last) a_rdb[$1] = $0
else {
if (a_rdb[$1] == NULL) a_rdb[$1] = $0
}
}
END {
if (rc) exit(rc)
for(i in a_rdb) print a_rdb[i] > o_file
}
#
# End of program.
#
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