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How about
echo /dir1/dir2/dir3/$(date +"%Y/%m/%d")/init* | wc -w

You might want to consider shell's parameter expansion (no external cammnd like sed necessary):
for FN in *.txt; do echo mv $FN ${FN#*-}; done

I have added sample script for a single file, please change it to multiple files like

ls file*

Please give it a try and let us know if there are any problems.

Please post what have you tried, where are you struck.

Here is a sample.

ls 12345-zxys.213423.zyz.txt | while read file
do
newfilename=`echo $file | sed 's/^.*-//'`
mv $file $newfilename...