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Delete all but 3 newest files

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# 1  
Old 08-09-2018
Delete all but 3 newest files
This is related to my post on backup up files.

I really appreciate all the help too. :-)

I would like to delete all but the 3 newest files in my backup directory.

/media/andy/MAXTOR_SDB1/Ubuntu_Mate_18.04/

For example
Code:
Ubuntu_Documents.zip_09Aug2018_12_00
Ubuntu_Documents.zip_09Aug2018_12_34
Ubuntu_Documents.zip_09Aug2018_12_40
Ubuntu_Documents.zip_09Aug2018_12_42
Ubuntu_Documents.zip_09Aug2018_12_43

# 2  
Old 08-09-2018
Had you taken to heart the advice given in your other thread to use an easy to sort date format (2018-08-01T01:02, or epoch seconds), it would be a simple
Code:
ls -1r Ubuntu_Documents.zip_* | tail -n+4

to find the to-be-deleted files...
# 3  
Old 08-09-2018
I put the date first.

2018-08-09-13_Ubuntu_Documents.zip
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