changed layout a bit

disk-usage-alert3.sh

#!/bin/bash
# [ -x /usr/bin/clear_console ] && /usr/bin/clear_console -q

#maybe this script hangs:
#https://unix.stackexchange.com/questions/21199/why-is-df-hanging

clear
clear

toggle=1

ignore_re='^Filesystem|tmpfs|cdrom'
# ignore_mounted_at='^\b(dev|run)\b'
ignore_filesystem='^\b(dev|run)\b'
while read -r line; do
  [[ $line ]] || continue # skip empty lines
  [[ $line =~ $ignore_re ]] && continue

  read -r filesystem blocks_total blocks_used blocks_avail cap_pct mounted_at _ <<<"$line"
  # below is a noop but makes set -x output more useful
  : filesystem="$filesystem" blocks_total="$blocks_total" blocks_used="$blocks_used" blocks_avail="$blocks_avail" cap_pct="$cap_pct" mounted_at="$mounted_at"
  usep=${cap_pct%"%"} # trim trailing % sign
  usep=${usep%.*}     # round (down) to nearest decimal
  gb1=${blocks_avail%.*}     # round (down) to nearest decimal

#  [[ $mounted_at =~ $ignore_mounted_at ]] && continue
  [[ $filesystem =~ $ignore_filesystem ]] && continue

# To do rounding up in truncating arithmetic, simply add (denom-1) to the numerator.
# gb=10000 + gb1

# echo ">>>>> $mounted_at <<<<<" | sed -e 's/.*/[^\/]*/X/g' -e 's/[0-9]/N/g'
# sed -r 's/{{regex}}/{{replace}}/g' {{filename}}
# sed -r '/.*/g' {{$mounted_at}}

if((toggle=1)); then
   newtoggle=0
fi
if((toggle=0)); then
   newtoggle=1
fi
toggle=$newtoggle

  if (( usep < 100 )); then
#echo $toggle
#echo $newtoggle
printf "$mounted_at" | sed -e 's/.*\//\/  /g' # printf ends without newline
echo " = $filesystem"
printf "   $blocks_avail bytes" # printf ends without newline

GBavail="$((($gb1+1)/1000000))"
  if (( GBavail > 1 )); then
# echo "$gb1 = gb1"
# echo "$((($gb1+1)/1000000)) = GB avail"
printf " = $GBavail GB free"

# mounted_short=$"$mounted_at" | sed -e 's/.*\//$/g'
  fi
  echo "" # just a newline
fi



  if (( usep < 90 )); then
    # mail -s "Alert: Almost out of disk space $usep%" name@asldfkjasöldkfjasöldkfsajf.com <<EOF 
# $filesystem (mounted on $mounted_at) usage is $usep on $(hostname) as of $(date)
#echo " ^_^ $usep%used "
echo "\___^_^_$usep%used___________________/"
fi

  if (( usep >= 90 && usep < 100 )); then
# layout=2
isALERT=1
    # mail -s "Alert: Almost out of disk space $usep%" name@asldfkjasöldkfjasöldkfsajf.com <<EOF 
# $filesystem (mounted on $mounted_at) usage is $usep on $(hostname) as of $(date)
echo " :-( $usep%used ALERT ALERT ALERT ALERT ALERT"

#echo "/^^^^^^^^^^^^^^^^^^^^^^"
echo "\_________________________________/"

  fi



done < <(df -P)