ls and non-equivalence between -1 and single-column

[Radu Grigore]

The GNU coreutils documentation [1] suggests that "-1" and
"--format=single-column" are equivalent, yet the following two
commands produce different results:
  ls -l -1
  ls -l --format=single-column
According to POSIX [2] both behaviors are correct (for "ls -l -1"), so
I guess you need to pick one or update the docs.

[1] 
http://www.gnu.org/software/coreutils/manual/html_node/General-output-formatting.html#General-output-formatting
[2] http://www.opengroup.org/onlinepubs/009695399/utilities/ls.html

tried with: coreutils package 6.10-3ubuntu2