PCGen Linux/MacOS start script modifications

pcgen.sh

#!/bin/sh

set -e

#### on some installations you may need to change /bin/sh above to /bin/bash

# Adding the following lines, makes the pcgen script work from any directory
############################################################################
rreadlink() (
  target=$1 fname= targetDir= CDPATH=
  { \unalias command; \unset -f command; } >/dev/null 2>&1
  [ -n "$ZSH_VERSION" ] && options[POSIX_BUILTINS]=on

  while :; do
      [ -L "$target" ] || [ -e "$target" ] || { command printf '%s\n' "ERROR: '$target' does not exist." >&2; return 1; }
      command cd "$(command dirname -- "$target")"
      fname=$(command basename -- "$target")
      [ "$fname" = '/' ] && fname=''
      if [ -L "$fname" ]; then
        target=$(command ls -l "$fname")
        target=${target#* -> }
        continue
      fi
      break
  done
  targetDir=$(command pwd -P)
  if [ "$fname" = '.' ]; then
    command printf '%s\n' "${targetDir%/}"
  elif  [ "$fname" = '..' ]; then
    command printf '%s\n' "$(command dirname -- "${targetDir}")"
  else
    command printf '%s\n' "${targetDir%/}/$fname"
  fi
)

SCRIPTDIR=$(dirname -- "$(rreadlink "$0")")
cd ${SCRIPTDIR}
############################################################################


# Adding the folling if, will create a pcgen desktop file if one does not already exist
#######################################################################################
if [ "$OSTYPE" = "linux-gnu" -a  ! -f "$HOME/.local/share/applications/pcgen.desktop" ]; then
        echo -e "[Desktop Entry]\nType=Application\nEncoding=UTF-8\nName=PCGen\nuomment=PCGen helps you build characters for role-playing games like Pathfinder and D&D\nTerminal=False\nExec=${SCRIPTDIR}/pcgen.sh\nIcon=${SCRIPTDIR}/docs/images/system/pcgen_small_logo.jpg\n" > "$HOME/.local/share/applications/pcgen.desktop"
        update-desktop-database
fi

##### <the following is the remainder of the script> ####
available_memory="unknown"
default_min_memory=256
default_max_memory=512