Question

1

How delete files - based on date in filename

rated 0 times [ 1] [ 0] / answers: 1 / hits: 4841 / 3 Years ago, tue, november 9, 2021, 2:43:11

I have some folder with files with the names as "example_YY_MM_DD-HH.zip" and I have 3 backups per day. I need this:

1) For backups older than 1 week I need only one per day (at midnight '00' at HH)

2) For backups older than month I need only one backup per week.

3) For backups older than one year I need only one backup per month (first day of month)

I have only this and I dont know what put to IF part.

Thanks

#!/bin/sh

export NOW=$(date +"%d-%m-%Y")

export OUTPUT=/media/backup/logs/delete-old.txt

export BACKUP_DIR=



for file in $BACKUP_DIR

do

if $file



fi

done

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answered 3 Years ago enefiama · Accepted Answer

This should work (if you set the correct full or relative path it is currently on the directory test)

#! /bin/bash



nowday=$(date +"%d")

nowmonth=$(date +"%m")

nowyear=$(date +"%y")



#number of days since 1 Jan 1970 (today)

nowdays=$(($(date --date="20$nowyear-$nowmonth-$nowday" +"%s")/86400))



backup_dir="test/*"

#echo $backup_dir

for file in $backup_dir

do

  hour=${file: -6: -4}

  day=${file: -9: -7}

  month=${file: -12: -10}

  year=${file: -15: -13}

  #number of days since 1 Jan 1970 (file)

  days=$(($(date --date="20$year-$month-$day" +"%s")/86400))

  if ((days < nowdays-365)); then

    # more than one year

    if ((10#$day == 1))&&((10#$hour == 0)); then

      #day is 1 hour is 0 (we keep) use this space if you want to copy or something!

      :

    else

      #Wrong day or hour

      rm $file

    fi

  else if ((days < nowdays-31)); then

    # more than one month (31 days)

    if (((10#$day == 1))||((10#$day == 8))||((10#$day == 15))||((10#$day == 22))||((10#$day == 29)))&&((10#$hour == 0)); then

      #day is 1,8,15,22,29 hour is 0 (we keep) use this space if you want to copy or something!

      :

    else

      #Wrong day or hour

      rm $file

    fi

  else if ((days < nowdays-7)); then

    # more than one week

    if ((10#$hour == 0)); then

      #hour is zero se this space if you want to copy or something!

      :

    else

      #Wrong hour

      rm $file

    fi

  else

    # less than one week (we keep) use this space if you want to copy or something!

    :

  fi fi fi





done

I have defined a month as 31 days always for checking if over 1 month. For once a week I pick days 1 8 15 22 and 29, so there is always the first day of the month. This also works on the back catalogue because it checks for midnight for each file.

The : lines are just place holders in case you want to put code there.

Give it a check before running it on everything, just in case there is an error!