Zach Boychuk: Richard Head 93: The Career of Zach Boychuk

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macOS Sierra: Generating Integers with Arbitrary Size

Command (Testing with 15 digits):

$ rnd=$(cat /dev/urandom | LC_CTYPE=C tr -dc 0-9 | fold -w15 | head -1 | sed 's/^0*//;'); echo $rnd; echo $(($rnd / 2));


Result (Second line is the number half the size of the first line to test if arithmetic operation works):

585206567422781
292603283711390

macOS Sierra: Bash (Unix shell): Associative Array Example

Command:

$ cat associative_array.sh


Result:

#!/bin/bash

aa=(
'スライム::100'
'キメラ::10'
'犬::20'
'猫::80'
)

total=0

for k in "${aa[@]}"
do
value="${k##*::}"
total=$((total + value))
done

echo "Total: $total"

index=$1

current=0

for k in "${aa[@]}"
do
value="${k##*::}"
current=$((current + value))

if [ $index -le $current ]
then
name="${k%%::*}"
echo "Index $index: $name"
break
fi
done


Commands & Results:

$ ./associative_array.sh 0
Total: 210
Index 0: スライム
$ ./associative_array.sh 1
Total: 210
Index 1: スライム
$ ./associative_array.sh 10
Total: 210
Index 10: スライム
$ ./associative_array.sh 99
Total: 210
Index 99: スライム
$ ./associative_array.sh 100
Total: 210
Index 100: スライム
$ ./associative_array.sh 101
Total: 210
Index 101: キメラ
$ ./associative_array.sh 110
Total: 210
Index 110: キメラ
$ ./associative_array.sh 111
Total: 210
Index 111: 犬
$ ./associative_array.sh 130
Total: 210
Index 130: 犬
$ ./associative_array.sh 131
Total: 210
Index 131: 猫
$ ./associative_array.sh 200
Total: 210
Index 200: 猫
$ ./associative_array.sh 209
Total: 210
Index 209: 猫
$ ./associative_array.sh 210
Total: 210
Index 210: 猫
$ ./associative_array.sh 211
Total: 210

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