insert characters into string with sed

# echo 20150429 | sed -e 's/\(.\{4\}\)\(.\{2\}\)/\1\/\2\//'
2015/04/29

Start with a single flat directory with thousands of log files…

# ls | head -5
db301.20140216.log.gz
db301.20140217.log.gz
db301.20140218.log.gz
db301.20140219.log.gz
db301.20140220.log.gz

Now move timestamped files into sorted directory by day

# for i in `ls`; do j=$(echo $i| cut -d . -f 2  | sed -e 's/\(.\{4\}\)\(.\{2\}\)/\1\/\2\//'); mkdir -p $j && mv $i $j; done;


check your work

# find . -type f | head -5
./2014/02/16/db301.20140216.log.gz
./2014/02/17/db301.20140217.log.gz
./2014/02/18/db301.20140218.log.gz
./2014/02/19/db301.20140219.log.gz
./2014/02/20/db301.20140220.log.gz

forgot to rename files

# for i in `find . -mindepth 3 -type d `; do pushd $i; for j in `ls`; do k=$(echo $j | sed -e 's/\(\.[0-9]\{8\}\)//' ); mv $j $k;done; popd; done;

check your work

# find . -type f | head -5
./2014/02/16/db301.log.gz
./2014/02/17/db301.log.gz
./2014/02/18/db301.log.gz
./2014/02/19/db301.log.gz
./2014/02/20/db301.log.gz

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