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function error {
  printf "ERROR: $1\n" >&2 
}
function warning {
  printf "WARNING: $1\n"
}
function info {
  printf "INFO: $1\n"
}
function println {
  printf "$1\n"
}
function block {
  printf "\n$3\n$1 \t[$2]\n$3\n"
}
function fail {
  println "\n" 
  println "FAIL"$1
  println
}
function checkz {
  if [ -z $1 ]; then
    error "empty string"
    return 1
  fi  
  info "string \"$1\" \t[OK]"
  return 0
}
function checkx {
  if [ ! -x $1 ]; then
    error "$1 \t[NOT FOUND]"
    return 1
  fi  
  info "$1 \t[OK]"
  return 0
}
function checkb {
  if [ ! -b $1 ]; then
    error "$1 \t[NOT FOUND]"
    return 1
  fi  
  info "$1 \t[OK]"
  return 0
}
function checkc {
  if [ ! -c $1 ]; then
    error "$1 \t[NOT FOUND]"
    return 1
  fi  
  info "$1 \t[OK]"
  return 0
}
function checkf {
  if [ ! -f $1 ]; then
    error "$1 \t[NOT FOUND]"
    return 1
  fi  
  info "$1 \t[OK]"
  return 0
}
function checkd {
  if [ ! -d $1 ]; then
    error "$1 \t[NOT FOUND]"
    return 1
  fi  
  info "$1 \t[OK]"
  return 0
}
function checkd_mk {
  if [ ! -d $1 ]; then
    info "$1 \t[NOT FOUND]"
    info "$1 \t[MAKING...]"
    mkdir -p $1
    checkd $1
    return $?
  fi  
  info "$1 \t[OK]"
  return 0
}
function sized {
  sized=($(ls $1))
  return ${#sized[@]}
}
                                     
        
            Вспомогательные функции проверки файлов и директорий, а также вывода ошибок