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I have a directory containing a high number of files (like logs for every day of the year). I would like to remove all files created before let's say 22/11. How can I achieve that ? Must I use find then exec -rm? I'm using ksh.

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Using find is still the preferred way of deleting files. See http://mywiki.wooledge.org/UsingFind for more.

One way of doing this is to create a file with the time-stamp in it. e.g

touch -t 201311220000 /tmp/timestamp

Now delete the files GNUfind (assuming in the current directory) that match the time-stamp e.g:

find . -type f ! -newer /tmp/timestamp -delete  

or non GNU find

find . -type f ! -newer /tmp/timestamp -exec rm {} \;
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What about this ? Does it work ? find -type f -mtime +5 -exec rm -f {} \; – user1058398 Nov 27 '13 at 13:56
@user1058398 That will delete files older than 5 days from now. – val0x00ff Nov 27 '13 at 14:23

With GNU or some BSD finds:

find . ! -newermt 2013-11-22 ! -type d -delete

Note that it checks the last modification time of the files. On some BSDs, you can use -newerBt in place of -newermt to check the file's inode birth time if available instead.

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