1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
|
#!/usr/bin/mawk -We
# *********************************************************************
# Written by and copyright Carlo Strozzi <carlos@linux.it>.
#
# random: pick one or more records at random from a table.
# 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.
#
# 2001-06-09 Alpha code.
# 2001-08-17 Added stdio portability
#
# $Id$
# *********************************************************************
BEGIN {
NULL = ""; FS = OFS = "\t"; n = 1; srand()
while (ARGV[++i] != NULL) {
if (ARGV[i] == "-L" || ARGV[i] == "--lines") n = ARGV[++i]
else if (ARGV[i] == "-N" || ARGV[i] == "--no-header") no_hdr = 1
else if (ARGV[i] == "-z" || ARGV[i] == "--zero") zero = 1
else if (ARGV[i] == "-K" || ARGV[i] == "--key") key = 1
else 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] == "-h" || ARGV[i] == "--help") {
system("grep -v '^#' @DOCPATH@/random.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) {
if (key) print $1 > o_file
else print > o_file
}
next
}
NR == int(rand()*NR+1) {
found++
if (key) print $1 > o_file
else print > o_file
if (found == n) exit
}
END {
if (NR > 2 && !zero && !found) {
if (key) print $1 > o_file
else print > o_file
}
}
#
# End of program.
#
|
