partialpassword.sh

#!/bin/bash
# ------------------------------------------------------------------------------
# Creates a new wordlist from a wordlist by replacing all ambiguous characters 
# with all their possible combinations.
#
# Usage: partialpassword.sh input.txt output.txt O0 [Il1 ...]
#
# Using "-" as the input reads the passwords from stdin.
# Using "-" as the output prints the wordlist to stdout.
#
# Author : Esa Jokinen (oh2fih)
# Home   : https://github.com/oh2fih/Misc-Scripts
# ------------------------------------------------------------------------------

if [ "$#" -lt 3 ]; then
  printf "\n%s\n" "Usage: $0 input.txt output.txt O0 [Il1 ...]" >&2
  printf "\n%s\n" "Using \"-\" as the input reads the passwords from stdin." >&2
  printf "%s\n" "Using \"-\" as the output prints the wordlist to stdout." >&2
  exit 1
fi

if ! command -v sed &> /dev/null; then
  printf "\n%s\n" "This script requires sed!" >&2
  exit 1
fi

if ! command -v awk &> /dev/null; then
  printf "\n%s\n" "This script requires awk!" >&2
  exit 1
fi

if [ "$2" != "-" ]; then
  if [ -f "$2" ]; then
    printf "\n%s %s\n" "$2" "already exists." >&2
    if [ "$1" = "-" ]; then
      exit 1
    else
      read -r -p "Overwrite? (y/N) " answer
      if [ "${answer,,}" != "y" ]; then
        exit 1
      fi
    fi
  fi
fi

# Read file or stdin.
pwlist=$(cat "$1") || exit 1

for alternatives in "${@:3}"; do

  # First, replace all other characters with the first one.
  for (( i=1; i<${#alternatives}; i++ )); do
    pwlist=$(
      printf "%s" "$pwlist" \
        | sed 's/'"${alternatives:$i:1}"'/'"${alternatives:0:1}"'/g'
      )
  done

  # Get max number of characters to be replaced.
  max=$(
    printf "%s" "$pwlist" \
      | sed 's/[^'"$alternatives"']//g' \
      | awk '{ print length }' \
      | sort -n \
      | tail -n 1
    )

  # Add new combinations.
  for (( i=1; i<${#alternatives}; i++ )); do
    for (( j=1; j<=max; j++ )); do
      for (( k=max; k>=j; k-- )); do
        new=$(
          printf "%s" "$pwlist" \
            | sed "s/""${alternatives:0:1}""/""${alternatives:$i:1}"/"$k"""
          )
        pwlist=$(printf "%s\n%s" "$pwlist" "$new" | sort -u)
      done
    done
  done

done

# Save the file or print the output to stdout.
if [ "$2" = "-" ]; then
  printf "%s\n" "$pwlist"
else
  printf "%s\n" "$pwlist" > "$2" || exit 1
  printf "\n%s\n" "Done."
fi