Question

I have multiple files ( > 1000) with same name in different subdirectories

dir1/out.txt

   # white row
    1 2 3 4 5
    3 3 4 5 6 
    4 1 4 5 8
    # white row

dir2/out.txt

 # white row  
    1 2 3 4 5
    3 3 4 5 6 

    4 1 4 5 8
    # white row 

dir3/out.txt

# white row 
1 2 3 4 5
3 3 4 5 6 
4 1 4 5 8
# white row 

I want to remove all white spaces (usually at heading row, tail row and in between rows.

Is there is quick way to do in Unix ? Apolozie for simple question.

Edit:

I am not trying to remove every space rather just whole lines that are white spaces

Answer 1

This will find all the files named out.txt in subdirectories of present working directory and deletes while-space containing lines from each file.

find . -name "out.txt" -exec sed -i '/^$/d' '{}' \;

Note: You must own write permissions to modify these files.