Post your handy utility scripts!

[Kresimir]

Here is a little script that generates mixed case:

#!/bin/bash
# A sImPlE sCrIpt tHAt GeNErAtEs MiXed cAse FroM ItS STdIn

max_repeat=2

function coinflip() {
  printf $(($RANDOM%2))
}

while read line; do
  uppercase_line="${line^^}"
  lowercase_line="${line,,}"
  len=${#line}
  flip=$(coinflip)
  n=0

  for ((i = 0; i < len; i++)); do
    oldflip=$flip
    flip=$(coinflip)

    if ((flip == oldflip)); then
      ((n++))
    fi

    if ((n >= max_repeat)); then
      n=0
      ((flip = !flip))
    fi

    if ((flip)); then
      printf '%s' "${uppercase_line:$i:1}"
    else
      printf '%s' "${lowercase_line:$i:1}"
    fi
  done

  printf '\n'
done < "${1:-/dev/stdin}"

Usage:

$ ./mixcase <<< 'Just pipe text into it and it will create mixed case!'
jUsT pIpE tExt inTo iT aNd It wiLL cReaTe miXeD cASe!

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2023-08-23: Updated the script to not use sed, but instead use built-in Bash string manipulation techniques.