在linux使用ls命令时，ls -l 默认只显示“月-日”，而不显示“年”，这样就给我们查看文件的时间属性带来困扰，这时侯，我们可以指定time-style（时间显示类型）。
style’List timestamps in style. style. The style should
be one of the following:
format’List timestamps using format, where format is interpreted
like the format argument of date
For example, --time-style="+%Y-%m-%d %H:%M:%S"
to list timestamps like ‘2002-03-30 23:45:56
, format's interpretation is affected by the
If format contains two format strings separated by a newline,
the former is used for non-recent files and the latter for recent
files; if you want output columns to line up, you may need to insert
spaces in one of the two formats.
’List timestamps in full using ISO 8601 date, time, and time zone
format with nanosecond precision, e.g., ‘2002-03-30
’. This style. is equivalent to
‘+%Y-%m-%d %H:%M:%S.%N %z
This is useful because the time output includes all the information that
is available from the operating system. For example, this can help
explain make's behavior, since GNU make
uses the full timestamp to determine whether a file is out of date.
’List ISO 8601 date and time in minutes, e.g.,
’. These timestamps are shorter than
’ timestamps, and are usually good enough for everyday
work. This style. is equivalent to ‘+%Y-%m-%d %H:%M
’List ISO 8601 dates for non-recent timestamps (e.g.,
’), and ISO 8601 month, day, hour, and
minute for recent timestamps (e.g., ‘03-30 23:45
timestamps are uglier than ‘long-iso
’ timestamps, but they carry
nearly the same information in a smaller space and their brevity helps
output fit within traditional 80-column output lines.
The following two ls
invocations are equivalent:
ls -l --time-style="+%Y-%m-%d $newline%m-%d %H:%M"
ls -l --time-style="iso"
’List timestamps in a locale-dependent form. For example, a Finnish
locale might list non-recent timestamps like ‘maalis 30 2002
and recent timestamps like ‘maalis 30 23:45
timestamps typically consume more space than ‘iso
’ timestamps and
are harder for programs to parse because locale conventions vary so
widely, but they are easier for many people to read.
The LC_TIME locale category specifies the timestamp format. The
default POSIX locale uses timestamps like ‘Mar 30 2002’ and ‘Mar 30 23:45’; in this locale, the following two
ls invocations are equivalent:
ls -l --time-style="+%b %e %Y$newline%b %e %H:%M"
ls -l --time-style="locale"
Other locales behave differently. For example, in a German locale,
--time-style="locale" might be equivalent to
--time-style="+%e. %b %Y $newline%e. %b %H:%M"
and might generate timestamps like ‘30. Mär 2002 ’ and
‘30. Mär 23:45’.
style’List POSIX-locale timestamps if the LC_TIME
category is POSIX, style timestamps otherwise. For
example, the ‘posix-long-iso
’ style. lists
timestamps like ‘Mar 30 2002
’ and ‘Mar 30 23:45
’ when in
the POSIX locale, and like ‘2002-03-30 23:45
You can specify the default value of the --time-style option
with the environment variable TIME_STYLE; if TIME_STYLE is not set
the default style. is ‘locale’. GNU Emacs 21.3 and
later use the --dired option and therefore can parse any date
format, but if you are using Emacs 21.1 or 21.2 and specify a
non-POSIX locale you may need to set
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