The easy way to manage scientific publications and bookmarks
BibSonomy helps you to manage your publications and bookmarks, to collaborate with your colleagues and to find new interesting material for your research.
When you pipe the output, ls acts differently.
This fact is hidden away in the info documentation:
If standard output is a terminal, the output is in columns (sorted vertically) and control characters are output as question marks; otherwise, the output is listed one per line and control characters are output as-is.
To prove it, try running
ls
and then
ls | less