rand: --seed implemented.
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parent
0047319b1b
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60744cc445
60
rand/rand
60
rand/rand
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@ -10,7 +10,7 @@ rand - generate (pseudo-)random data
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=head1 SYNOPSIS
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B<rand> [-f FORMAT|--format FORMAT] [[I<from>] I<to>]
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B<rand> [-f FORMAT|--format FORMAT] [-s SEED|--seed SEED] [[I<from>] I<to>]
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=head1 DESCRIPTION
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@ -37,6 +37,13 @@ If I<from> is also given, numbers will be integers from I<from> to I<to>.
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Format number using I<FORMAT>. I<FORMAT> follows B<printf>s specification.
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=item B<--seed> I<SEED>
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=item B<-s> I<SEED>
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Use SEED for random number generator for reproducible numbers.
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=back
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@ -98,10 +105,16 @@ B<openssl>
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=cut
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randdata() {
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# Generate random 8-bit data by AES encrypting /dev/zero with a
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# random key
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key=$(openssl rand -hex 16)
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iv=$(openssl rand -hex 16)
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# Generate random 8-bit data by AES encrypting /dev/zero
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if [ "$seed" == "" ] ; then
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# use a random key
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key=$(openssl rand -hex 16)
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iv=$(openssl rand -hex 16)
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else
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# use seed from --seed
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key=$(echo "$seed" | openssl sha256 -hex | cut -d' ' -f2)
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iv=$(echo "$seed" | openssl sha512 -hex | cut -d' ' -f2)
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fi
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< /dev/zero openssl enc -aes-128-ctr -K $key -iv $iv 2>/dev/null
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}
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export -f randdata
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@ -131,6 +144,7 @@ fmt='%s\n'
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while true; do
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case "$1" in
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-f | --fmt ) fmt="$2"; shift 2 ;;
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-s | --seed ) seed="$2"; shift 2 ;;
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-D | --debug ) debug=true; shift ;;
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-h | --help ) help=1; shift 2 ;;
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-- ) shift; break ;;
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@ -139,16 +153,32 @@ while true; do
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done
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qfmt="$(parallel --shellquote --shellquote ::: "$fmt")"
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if [ "$1" == "" ] ; then
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# Boost performance by running 1 per CPU core
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eval parallel -u randdata ::: {1..$(parallel --number-of-threads)}
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else
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# $1 set => numerical
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if [ "$2" == "" ] ; then
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# 0 .. $1
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eval parallel -N0 --lb randints 0 $1 "$qfmt" ::: {1..$(parallel --number-of-threads)}
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if [ "$seed" == "" ] ; then
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if [ "$1" == "" ] ; then
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# Boost performance by running 1 per CPU core
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eval parallel -u randdata ::: {1..$(parallel --number-of-threads)}
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else
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# $1 .. $2
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eval parallel -N0 --lb randints $1 $2 "$qfmt" ::: {1..$(parallel --number-of-threads)}
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# $1 set => numerical
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if [ "$2" == "" ] ; then
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# 0 .. $1
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eval parallel -N0 --lb randints 0 $1 "$qfmt" ::: {1..$(parallel --number-of-threads)}
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else
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# $1 .. $2
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eval parallel -N0 --lb randints $1 $2 "$qfmt" ::: {1..$(parallel --number-of-threads)}
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fi
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fi
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else
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if [ "$1" == "" ] ; then
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# Run a single instance
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randdata
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else
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# $1 set => numerical
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if [ "$2" == "" ] ; then
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# 0 .. $1
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randints 0 $1 "$fmt"
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else
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# $1 .. $2
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randints $1 $2 "$fmt"
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fi
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fi
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fi
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