#!/bin/bash
# 05/26/11
# dayid@dayid.org
# Cleans out .trash file whenever disk space is less than 5% available for /home
# This is because I use my "del" command rather than RM.
# Note: my ~/.trash is a symlink to ~/.local/share/Trash/files since I use gnome
# This should be run in a crontab as necessary.
#
# Default to allow up to 95% of /home to be used... allow override with a variable
if [ $1 ];then CLEANOUT=$1; else CLEANOUT=95; fi
date > ~/.cleantrash
echo "Proceeding with cleanout ${CLEANOUT}%" | tee -a ~/.cleantrash
cd ~/.trash/
# The following line may need to be modified pending how your df output is.
# The below line works for my regular-fs system, but for my
# Fedora Core system with LVM, I need to use '{ print $4 }'
# You'll also need to change the other 2 (total of 3) occurrences of '{ print $5 }'
CHECK=$( df -h /home | tail -n 1 | awk '{ print $5 }' | cut -d "%" -f "1" )
CHECK1=$CHECK
echo "Disk usage is ${CHECK}%" | tee -a ~/.cleantrash
if [ $CHECK -gt $CLEANOUT ]
   then echo "Since ${CHECK}% is > ${CLEANOUT}%, it's time to clean." | tee -a ~/.cleantrash
 	ls -a | egrep "[\'\"\(\)\&\#\$\^\!\-\ ]" > ~/.namestrash
        while read FILE; do
              NEW=`echo ${FILE} | tr "[\'\"\(\)\&\#\$\^\!\-\ ]" '_'`
              mv -f -- "${FILE}" "${NEW}" && echo "Renamed: ${FILE} to ${NEW}"
        done < ~/.namestrash
        find . -size 0 -exec /bin/rm -fv {} \; | tee -a ~/.cleantrash
        while [ $CHECK -gt $CLEANOUT ]; do 
              RMFILE=`ls -trc | head -2 | tail -1`
              if [ $RMFILE ]; then true
                 else echo "Trash is empty but /home is still ${CHECK}% full and you wanted ${CLEANOUT}%" | tee -a ~/.cleantrash
                      cat ~/.cleantrash | mail -s "cleantrash.sh: Can't clear more space" dayid && echo "Mailing you"
                      exit 1
              fi
              /bin/rm -rfv -- "${RMFILE}" | tee -a ~/.cleantrash
              CHECK=$( df -h /home | tail -n 1 | awk '{ print $5 }' | cut -d "%" -f "1" )
        done
        CHECK2=$( df -h /home | tail -n 1 | awk '{ print $5 }' | cut -d "%" -f "1" )
        echo "Disk usage is now ${CHECK2}% of allowed ${CLEANOUT}%. It was ${CHECK1}% when we started." | tee -a ~/.cleantrash
        cat ~/.cleantrash | mail -s "cleantrash.sh: Had to remove files in .trash to save space" dayid && echo "Mailing you a list of removed files"
   else echo "${CHECK}% is <= ${CLEANOUT}%, exiting"; exit 0
fi