Clean releases directories over 4 days old

clean.sh

#!/bin/bash

# releases should be name after formatted timestamp 
# date "+%Y%m%d%H%M%S" in order to work

time_margin=$(date -d "4 days ago" "+%Y%m%d%H%M%S")
for i in $( ls releases ); do
    if [ "$time_margin" -gt "$i" ]; then
      echo "$i will be removed"
      rm -rf releases/$i
      echo "$i removed"
    else
      echo "$i will prevail"
    fi
done