[LTP] [PATCH] runltp: add -R option for randomize test order

[Cyril Hrubis]

Hi!
> +#######################################################################
> +# Copyright (c) 2016 Red Hat Inc.,  All Rights Reserved.
> +#
> +# 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 would 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, see <http://www.gnu.org/licenses/>.
> +#
> +# Author: Zorro Lang <zlang@redhat.com>
> +#
> +#######################################################################
> +
> +# randomize all lines of stdin
> +
> +function randomize(array, N) {
> +	for(i = 0; i < N; i++) {
> +		j = int(rand()*N)
> +		if ( i != j) {
> +			tmp = array[i]
> +			array[i] = array[j]
> +			array[j] = tmp
> +		}
> +	}
> +	return
> +}
> +
> +{
> +	array[NR] = $0
> +}
> +
> +END {
> +	srand()
> +	randomize(array, NR)
> +	for(i = 0; i < NR; i++) printf("%s\n", array[i])
> +}

This is absurdly complicated for the task it does.

Newer GNU coreutils has shuf that does exactly what you want and there
is short -R as well, that more or less does what you want (the sort is
random unless there are duplicated lines in the input).

-- 
Cyril Hrubis
chrubis@suse.cz