Checks all files and directories next to itself. If there "last modified date" is older then given days (file_live_time_in_days) it remove those data.

cleaner.sh

#!/usr/bin/env bash

# cleaner.sh by Philipp Dahse <ph.dahse@gmail.com>
# ------------------------------------------------
# checks all files and directories next to itself. 
# If there "last modified date" is older then given days (file_live_time_in_days)
# it remove those data.
# I use this script in something like a personal tmp directory:
#   
#   /home/my/tmp/cleaner.sh
#
# When ever i fiddle about with some file or directories for temporary reasons i put it to /home/my/tmp
# On startup i run: /home/my/tmp/cleaner.sh >> /var/logs/cleaner.log 2>&1
# This keeps the data for 30 days and removes them afterwards

script_name="`basename $0`"
file_live_time_in_days=30

# Get path of this script for relative and absolute execution
script_path=$([[ "$0" != /* ]] && echo "$(cd $(pwd)/$(dirname $0);pwd)" || echo "$(dirname $0)")

function last_modified
{
    last_modified_full="$(stat -c %y $1)"
    echo ${last_modified_full:0:19}
}

function date_diff
{
    # Get date diff (http://stackoverflow.com/a/25097776/4216245)
    fullyear=$(date -d@$(( ( $(date -ud "$1" +'%s') - $(date -ud "$2" +'%s') ) )) +'%Y years %m months')
    yearsubtraction=$(( $(echo $fullyear | sed -r 's/^([0-9]+).*/\1/') - 1970 ))
    if [ $yearsubtraction -le '0' ]; then
        echo $fullyear | sed -r "s/^([0-9]+) years //"
    else
        echo $fullyear | sed -r "s/^([0-9]+) /$(printf %02d $yearsubtraction) /"
    fi
}

function log_removal
{
    type=$([[ -d $1 ]] && echo "DIR " || echo "FILE")
    log_time=`date +"%Y-%m-%d %T"`
    last_modified=$(last_modified "$1")
    diff=$(date_diff "$last_modified" "$log_time")
    echo "[$log_time] REMOVE $type [last_modified] $last_modified [age] $diff [expire age] $file_live_time_in_days days $1"
}

for x in `find "$script_path" -maxdepth 1 ! -name "$script_name" ! -name "." ! -name ".." -mtime +"$file_live_time_in_days"`
do
    log_removal $x
    rm -rf "$x"
done