unitproc/bkt-randFloat

   1 #!/bin/bash
   2
   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
  13
  14     # Validate input
  15     if [[ $# -eq 0 ]]; then
  16         : # do nothing
  17     elif [[ $# -eq 1 ]]; then
  18         arg1=$1;
  19         RETEST1='^[0-9]+$'
  20         if ! [[ $arg1 =~ $RETEST1 ]]; then
  21             echo "ERROR:Not an integer." >&2; exit 1;
  22         fi;
  23     else
  24         echo "ERROR:Invalid number of arguments:${*}";
  25     fi;
  26
  27     # Produce output
  28     decimals="$(head -c "${arg1:-5}" < <(LC_ALL=C tr -cd "[:digit:]" < <(cat /dev/urandom)))";
  29     printf "0.%s\n" "$decimals";
  30 }; # output random float [0.00000 1.00000] to stdout
  31 #==END Function Definitions==
  32
  33 #==BEGIN sample code==
  34 time randFloat;
  35 dec=5
  36 time randFloat;
  37 dec=70
  38 time randFloat;
  39 time (randFloat && randFloat && randFloat && randFloat && randFloat && randFloat && randFloat && randFloat && randFloat && randFloat);
  40 time (randFloat "$dec" && randFloat "$dec" && randFloat "$dec" && randFloat "$dec" && randFloat "$dec" && randFloat "$dec" && randFloat "$dec" && randFloat "$dec" && randFloat "$dec" && randFloat "$dec");
  41 time (randFloat "$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==