Greetings to all!!

I have one root folder containing several other folders inside it. This tree structure is deep. And the files are of similar extension.

I need to start at the top level and recursively search and rename all the files with say .a extension to .b .

This is the code to rename, but then I need to reach out each folder.
for i in *.vw ; do mv $i `echo $i | sed 's/vw/view/'` ; done

Could anybody help me by providing the outer for loop to traverse all the folders in between?

man find or search these forums for examples; there are plenty.

You can avoid the sed call, there's a simple substitution operator built into the shell itself.

mv "$i" "${i%.wv}.view"

In relation to http://www.unix.com/shell-programmin...-new-post.html just pipe the output of find to sed and trim away everything except the extension.

Find utility will go recursively down the line ...

for i in `find . -name "*.vw"`
 do
      mv "$i" "${i%.vw}.view"
 done

except that this method is prone to error with spaces in file names. use while loop instead

find . -name "*.mp3" | while read line; 
  do 
        mv "$line" .......
 done

Hi,

Below can list out all the different extension names in the current directory.
Hope it can help you a little.

getDel()
{
	cd $1
	for i in *
	do
		if [ $i != "*" ]
		then
			if [ -d $i ]
			then
				getDel $i
			else
				ls -l $i
			fi
		fi
	done
	cd ..
}

for i in *
do
if [ -d $i ]
then
	getDel $i
else
	ls -l $i
fi
done  > temp

awk '{
if (index($9,".")!=0)
{
	t=substr($9,index($9,".")+1,length($9)-index($9,"."))
	a[t]=1
}
}
END{
for ( i in a)
print i
}' temp
rm temp

Isn't that a bit excessive, code-wise?

find . -type f | sed -e 's/.*\.//' | sort | uniq -c | sort -rn