linux - Supressing 'Permission Denied' warning in du command -

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i want list size of sub-folders in directory. when try du -h --max-depth=1 output cluttered 'permission denied' statements such

du: cannot read directory `./folder_name': permission denied

how can suppress these warnings?

i tried workaround piping the output grep follows

du -h --max-depth=1 | grep -v 'du:'

but not seem working either!

try:

$ du -h --max-depth=1 2>/dev/null

this redirects stderr (file handle 2) /dev/null, ignoring error messages.

Ben