>>571
info ls

ちなみに、bsd系だとman lsにしっかり説明されている。
The Long Format
If the -l option is given, the following information is displayed for
each file: file mode, number of links, owner name, group name, number
of bytes in the file, abbreviated month, day-of-month file was last
modified, hour file last modified, minute file last modified, and the
pathname. In addition, for each directory whose contents are dis-
played, the total number of 512-byte blocks used by the files in the
directory is displayed on a line by itself, immediately before the
information for the files in the directory. If the file or directory
has extended attributes, the permissions field printed by the -l option
is followed by a '@' character. Otherwise, if the file or directory
has extended security information (such as an access control list), the
permissions field printed by the -l option is followed by a '+' charac-
ter.

If the modification time of the file is more than 6 months in the past
or future, then the year of the last modification is displayed in place
of the hour and minute fields.