Pasted

#!/bin/bash
#ncat --keep-open --sh-exec bla
for read line; do
 set -- $line
 command="$1"
 shift
 case  "$command $*" in
 "rm -rf"*)
   command=RMDA
   shift
   ;;
 esac
 case "$command" in
  "open *)
    cd ~
    echo 220 Operation successful"
  ;;
  "cd "*|"CWD "*)
   cd "$@"
   ;;
  ls|"ls "*|LIST|PWD) #PWD is the offical cmd
    ls "$@"
  ;;
  "QUIT"|"QUIT "*) #QUIT is the offical command
  #Disconnect
    break
    ;;
  "REIN"|"REIN "*)
   #Re initializes the connection.
  ;;
  bye|"bye "*)
    break
    ;;
  RMD|"RMD "*|"rm"|"rm "*|XRMD)
  #Remove a directory
  #XRMD RFC 775 Remove the directory
  rm "$@" 
  ;;
  RMDA|"RMDA "*) #RMDA is an official comma d
  #Remove a directory tree
  #https://datatracker.ietf.org/doc/draft-peterson-streamlined-ftp-command-extensions/
  #todo make sure its olay to delete directory" 
  rm -rf "$@"
  :;
  "put *")
   ;;
  SIZE)
   a_file=${@[-1]}
   unset -v '@[-1]'
    if [ -f $a_file ]; then
      ls -1s "$@"
    else
      du -h "$@"
    fi
    ;;
  XCUP)
    #XCUP RFC 775 Change to the parent of the current working directory
    cd ..
    ;;
  XMKD|mkdir)
    #XMKD RFC 775 Make a directory
    mkdir "$@"
    ;;
  XPWD)
    #XPWD RFC 775 Print the current working directory
   pwd
   ;;
  esac
done
   #Bathroom 7590
 
#https://tools.ietf.org/html/rfc959