04-07-2015
This successfully extracts lines with the correct label. But I am looking for only two lines for each label in labels.txt, and the lines should be randomly chosen. Can this script be piped to " gshuf -n 2"--or the equivalent--before the file is created?
What does $3 do in this code?
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LEARN ABOUT OPENSOLARIS
shuf
SHUF(1) User Commands SHUF(1)
NAME
shuf - generate random permutations
SYNOPSIS
shuf [OPTION]... [FILE]
shuf -e [OPTION]... [ARG]...
shuf -i LO-HI [OPTION]...
DESCRIPTION
Write a random permutation of the input lines to standard output.
Mandatory arguments to long options are mandatory for short options too.
-e, --echo
treat each ARG as an input line
-i, --input-range=LO-HI
treat each number LO through HI as an input line
-n, --head-lines=LINES
output at most LINES lines
-o, --output=FILE
write result to FILE instead of standard output
--random-source=FILE
get random bytes from FILE (default /dev/urandom)
-z, --zero-terminated
end lines with 0 byte, not newline
--help display this help and exit
--version
output version information and exit
With no FILE, or when FILE is -, read standard input.
AUTHOR
Written by Paul Eggert.
REPORTING BUGS
Report bugs to <bug-coreutils@gnu.org>.
COPYRIGHT
Copyright (C) 2006 Free Software Foundation, Inc.
This is free software. You may redistribute copies of it under the terms of the GNU General Public License
<http://www.gnu.org/licenses/gpl.html>. There is NO WARRANTY, to the extent permitted by law.
SEE ALSO
The full documentation for shuf is maintained as a Texinfo manual. If the info and shuf programs are properly installed at your site, the
command
info shuf
should give you access to the complete manual.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+--------------------+--------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+--------------------+
|Availability | SUNWgnu-coreutils |
+--------------------+--------------------+
|Interface Stability | Uncommitted |
+--------------------+--------------------+
NOTES
Source for GNU coreutils is available on http://opensolaris.org.
shuf 6.7 December 2006 SHUF(1)