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Loop through directory names

 
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# 1  
Old 07-25-2013
Loop through directory names
Some guidance is highly appreciated.

I have 10 directories with names ending with 'xyz', each of them have about 30000 files. I want to loop through the contents of each directory and produce a single output per directory. So I want to have 10 output files named 'directory_name'_out.

With multiple files I can do

Code:
for file in  *xyz
do
some command $file > $file_out
done

How do I do the same with directories?
# 2  
Old 07-25-2013
* will match directory and file names alike, so you can handle it exactly the same way.

30,000 files may easily be too many to fit into *, however. You could use ls with a read loop instead. Just beware that variables you change inside the 'while read' loop will not be affected outside the loop, because of the pipe.

Code:
for DIR in *
do
        [ -d "$DIR" ] || continue # Skip non-directories

        ls $DIR | while read FILE
        do
                do_something_to "$DIR/$FILE"
        done
done

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