我可以用 chown 一个文件chown myuser:mygroup /tmp/file，但是我怎么能看到一个文件是chowned谁，或者谁已经拥有它？像chown --show-who也许...
如何列出文件的用户和组？
一个简单的ls -l就行了。
-lUnix 命令的选项ls将使用long format. 简而言之，这为每个文件显示：
例子：
$ ls -l
-rw------- 1 root root 9560 23 mar 12:05 .bash_history
-rwxr-xr-x 1 root root 524 28 mai 2007 .bashrc
drwxr-xr-x 3 root root 3 4 nov 14:51 .cache
从FreeBSD ls 手册页（Linux 有点稀缺）：
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, MAC label,
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.
If the modification time of the file is more than 6 months in the past or
future, and the -D or -T are not specified, then the year of the last
modification is displayed in place of the hour and minute fields.
If the owner or group names are not a known user or group name, or the -n
option is given, the numeric ID's are displayed.
If the file is a character special or block special file, the device num-
ber for the file is displayed in the size field. If the file is a sym-
bolic link the pathname of the linked-to file is preceded by ``->''.
The listing of a directory's contents is preceded by a labeled total num-
ber of blocks used in the file system by the files which are listed as
the directory's contents (which may or may not include . and .. and other
files which start with a dot, depending on other options).
The default block size is 512 bytes. The block size may be set with
option -k or environment variable BLOCKSIZE. Numbers of blocks in the
output will have been rounded up so the numbers of bytes is at least as
many as used by the corresponding file system blocks (which might have a
different size).
The file mode printed under the -l option consists of the entry type and
the permissions. The entry type character describes the type of file, as
follows:
了解更多：
info ls在您的GNU/Linux系统上