How can I sort all files by size in a directory?

ls(1) /sort:

-S     sort by file size

$ ls -lhS

-l     use a long listing format
-h     with -l, print sizes in human readable format (e.g., 1K 234M 2G)
-S     sort by file size

If you have the appropriate sort version you may simply use:

du -h | sort -rh

mine is

$ sort --version
sort (GNU coreutils) 8.12

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