create random data tree 2

#!/usr/bin/env bash

# http://stackoverflow.com/questions/13400312/linux-create-random-directory-file-hierarchy
# Decimal ASCII codes (see man ascii); added space
AARR=( 32 {48..57} {65..90} {97..122} )
# Array count
aarrcount=${#AARR[@]}

OUTDIR="./rndpath"
ASCIIONLY=1
DIRDEPTH=5
MAXFIRSTLEVELDIRS=2
MAXDIRCHILDREN=12
MAXDIRNAMELEN=12
MAXFILECHILDREN=5
MAXFILENAMELEN=20
MAXFILESIZE=20
MINDIRNAMELEN=1
MINFILENAMELEN=1
MINDIRCHILDREN=1
MINFILECHILDREN=0
MINFILESIZE=1
FILEEXT=".bin"
VERBOSE=0 #1

get_rand_dirname() {
  if [ "$ASCIIONLY" == "1" ]; then
    for ((i=0; i<$((MINDIRNAMELEN+RANDOM%MAXDIRNAMELEN)); i++)) {
      printf \\$(printf '%03o' ${AARR[RANDOM%aarrcount]});
    }
  else
    cat /dev/urandom | tr -dc '[ -~]' | tr -d '[$></~:`\\]' | head -c$((MINDIRNAMELEN + RANDOM % MAXDIRNAMELEN)) | sed 's/\(["]\)/\\\1/g'
  fi
  #echo -e " " # debug last dirname space
}

get_rand_filename() {
  if [ "$ASCIIONLY" == "1" ]; then
    for ((i=0; i<$((MINFILENAMELEN+RANDOM%MAXFILENAMELEN)); i++)) {
      printf \\$(printf '%03o' ${AARR[RANDOM%aarrcount]});
    }
  else
    # no need to escape double quotes for filename
    cat /dev/urandom | tr -dc '[ -~]' | tr -d '[$></~:`\\]' | head -c$((MINFILENAMELEN + RANDOM % MAXFILENAMELEN)) #| sed 's/\(["]\)/\\\1/g'
  fi
  printf "%s" $FILEEXT
}

  echo "Removing old outdir $OUTDIR"
  rm -rf "$OUTDIR"
mkdir "$OUTDIR"

if [ $MAXFIRSTLEVELDIRS -gt 0 ]; then
  NUMFIRSTLEVELDIRS=$((1+RANDOM%MAXFIRSTLEVELDIRS))
else
  NUMFIRSTLEVELDIRS=0
fi

# create directories
for (( ifl=0;ifl<$((NUMFIRSTLEVELDIRS));ifl++ )) {
  FLDIR="$(get_rand_dirname)"
  FLCHILDREN="";
  for (( ird=0;ird<$((DIRDEPTH-1));ird++ )) {
    DIRCHILDREN=""; MOREDC=0;
    for ((idc=0; idc<$((MINDIRCHILDREN+RANDOM%MAXDIRCHILDREN)); idc++)) {
      CDIR="$(get_rand_dirname)" ;
      # make sure comma is last, so brace expansion works even for 1 element? that can mess with expansion math, though
      if [ "$DIRCHILDREN" == "" ]; then DIRCHILDREN="\"$CDIR\"" ;
      else DIRCHILDREN="$DIRCHILDREN,\"$CDIR\"" ; MOREDC=1 ; fi
    }
    if [ "$MOREDC" == "1" ] ; then
      if [ "$FLCHILDREN" == "" ]; then FLCHILDREN="{$DIRCHILDREN}" ;
      else FLCHILDREN="$FLCHILDREN/{$DIRCHILDREN}" ; fi
    else
      if [ "$FLCHILDREN" == "" ]; then FLCHILDREN="$DIRCHILDREN" ;
      else FLCHILDREN="$FLCHILDREN/$DIRCHILDREN" ; fi
    fi
  }
  DIRCMD="mkdir -p $OUTDIR/\"$FLDIR\"/$FLCHILDREN"
  eval "$DIRCMD"
  echo "$DIRCMD"
}

# now loop through all directories, create random files inside
# note printf '%q' escapes to preserve spaces; also here
# escape, and don't wrap path parts in double quotes (e.g. | sed 's_/_"/"_g');
# note then we STILL have to eval to use it!
# but now ls "$D" works, so noneed for QD
# unfortunately backslashes can make '%q' barf - prevent them
find "$OUTDIR" -type d | while IFS= read D ; do
  QD="$(printf '%q' "$(echo "$D")" )" ;
  [ "$VERBOSE" == "1" ] && echo "$D"; #echo "$QD"; ls -la "$D"; #eval "ls -la $QD";
  for ((ifc=0; ifc<$((MINFILECHILDREN+RANDOM%MAXFILECHILDREN)); ifc++)) {
    CFILE="$(get_rand_filename)" ;
    echo -n '> '
    [ "$VERBOSE" == "1" ] && echo "$D"/"$CFILE"
    cat /dev/urandom \
    | head -c$((MINFILESIZE + RANDOM % MAXFILESIZE)) \
    > "$D"/"$CFILE"
  }
done

#echo
#tree -a --dirsfirst -s "$OUTDIR"
#echo "total bytes: $(du -bs $(echo "$OUTDIR"))"