zdv2.bktei.com Git - BK-2020-03.git/blob

1 #!/bin/bash

3 #==BEGIN Function Definitions==

4 randFloat() {

5 # Desc: Output random float

6 # Usage: randFloat arg1

7 # Inputs: arg1: number of decimal places

8 # Output: stdout: float as decimal string

9 # Version: 0.1.1

10 # Note: Outputs float from 0.000... to 0.999...

11 # Note: Default number of decimals is 5.

12 # Ref/Attrib: Integer test regular expression https://stackoverflow.com/a/806923

14 # Validate input

     if [[ $# -eq 0 ]]; then

16 : # do nothing

     elif [[ $# -eq 1 ]]; then

18 arg1=$1;

19 RETEST1='^[0-9]+$'

         if ! [[ $arg1 =~ $RETEST1 ]]; then

             echo "ERROR:Not an integer." >&2; exit 1;

22 fi;

23 else

         echo "ERROR:Invalid number of arguments:${*}";

25 fi;

27 # Produce output

     decimals="$(head -c "${arg1:-5}" < <(LC_ALL=C tr -cd "[:digit:]" < <(cat /dev/urandom)))";

     printf "0.%s\n" "$decimals";

30 }; # output random float [0.00000 1.00000] to stdout

31 #==END Function Definitions==

33 #==BEGIN sample code==

34 time randFloat;

35 dec=5

36 time randFloat;

37 dec=70

38 time randFloat;

 time (randFloat && randFloat && randFloat && randFloat && randFloat && randFloat && randFloat && randFloat && randFloat && randFloat);

 time (randFloat "$dec" && randFloat "$dec" && randFloat "$dec" && randFloat "$dec" && randFloat "$dec" && randFloat "$dec" && randFloat "$dec" && randFloat "$dec" && randFloat "$dec" && randFloat "$dec");

 time (randFloat "$dec" &>/dev/null && randFloat "$dec" &>/dev/null && randFloat "$dec" &>/dev/null && randFloat "$dec" &>/dev/null && randFloat "$dec" &>/dev/null && randFloat "$dec" &>/dev/null && randFloat "$dec" &>/dev/null && randFloat "$dec" &>/dev/null && randFloat "$dec" &>/dev/null && randFloat "$dec" &>/dev/null);

42 #==END sample code==