Bash CHR program

Bash script that takes ascii code value - character, hexadecimal or octal - and returns corresponding representation:

Usage: chr.bsh [-D] <-d> <-h|-x> <-b> [-H] <char> [<-a> <code>]
 
       <char>   A valid ascii code value: character, decimal,
                hexadecimal, octal (0o000 or \000) 
OPTIONS:
          -d    Convert character to decimal 
          -a    Convert code (hex, octal) to ascii character 
       -h|-x    Convert character to hexadecimal 
          -b    Convert character to binary 
          -o    Convert character to octal 
          -H    Show help message
          -D    Turn on debug mode
          -?    Show usage
      
      ## Options may be duplicated and compounded in any order       
      $ chr.bsh A -d
        65
      $ chr.bsh A -d -b
        01000001
      $ chr.bsh A -d -b -x
        0x41
      $ chr.bsh A -d -b -x -o
        0o101
      $ chr.bsh A -d -b -x -o -b
        01000001
      $ chr.bsh A -d -b -x -o -b -h
        0x41
      $ chr.bsh A -d -b -x -o -b -h -a
        A
      ## Experimentally - it supports pipes and redirects! 
      $ echo A | chr.bsh -d -b
        01000001
      $ chr.bsh -d -b -x <<< A
        0x41
      ## Multiple characters from a string!  
      $ echo DEF | chr.bsh -d -b
        01000100
        01000101
        01000110
      $ chr.bsh -d -b -o <<< XYZ  | chr.bsh -a
        XYZ

https://github.com/AdamDanischewski/chr.bsh