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问题[coreutils](ubuntu)

Martin Hope
Alice
Asked: 2019-01-23 02:57:21 +0800 CST
  • 4

在阅读GNU Core Utilities - Wikipedia后，我发现多个总和

me@alpha:~$ cksum nohup.out 
4104911401 101860700 nohup.out
me@alpha:~$ b2sum nohup.out 
468c86394c5c4be04d0bce3b98584197b0c3f4cbb630144818f9d77d48ab7296e4c53db481b6bdd7c46dd5203d3f016d9ef01b126806e04be5003aeebb1bc6
22  nohup.out                                                                                                                
me@alpha:~$ sum nohup.out 
37767 99474
me@alpha:~$ sha1sum nohup.out 
79106925d593e18bd148ba94a6e4fb9da02e8c47  nohup.out
 me@alpha:~$ md5sum nohup.out 
3be4b17f18e4715d849a31ae482565cf  nohup.out

我几个月前开始学习linux，我是否必须区分它们并在日常操作中使用它们？

coreutils
Martin Hope
Alice
Asked: 2019-01-23 00:13:22 +0800 CST
  • 0

发出“消息”后

me@alpha:~$ mesg
 is y

手册指出

NAME
       mesg - display (or do not display) messages from other users

这是否意味着有人入侵了我的机器并留言？

coreutils
Martin Hope
Gowtham
Asked: 2018-08-11 05:04:13 +0800 CST
  • 2

如何通过在语言环境中date进行修改来更改命令格式LC_TIME？

目前，月份中的日期使用%e格式。我需要它以%d格式显示。

以下是当前格式：

#date
Thu Aug 9 18:26:11 IST 2018

预期格式：

#date
Thu Aug 09 18:26:11 IST 2018

这是我的语言环境：

#locale
LANG=en_US.UTF-8
LANGUAGE=
LC_CTYPE=en_IN
LC_NUMERIC="en_US.UTF-8"
LC_TIME="en_US.UTF-8"
LC_COLLATE="en_US.UTF-8"
LC_MONETARY="en_US.UTF-8"
LC_MESSAGES="en_US.UTF-8"
LC_PAPER="en_US.UTF-8"
LC_NAME="en_US.UTF-8"
LC_ADDRESS="en_US.UTF-8"
LC_TELEPHONE="en_US.UTF-8"
LC_MEASUREMENT="en_US.UTF-8"
LC_IDENTIFICATION="en_US.UTF-8"
LC_ALL=

LC_TIME中的部分/usr/share/i18n/locales/en_US：

    LC_TIME
abday   "Sun";"Mon";"Tue";"Wed";"Thu";"Fri";"Sat"
day "Sunday";/
    "Monday";/
    "Tuesday";/
    "Wednesday";/
    "Thursday";/
    "Friday";/
    "Saturday"

week 7;19971130;1
abmon   "Jan";"Feb";/
    "Mar";"Apr";/
    "May";"Jun";/
    "Jul";"Aug";/
    "Sep";"Oct";/
    "Nov";"Dec"
mon "January";/
    "February";/
    "March";/
    "April";/
    "May";/
    "June";/
    "July";/
    "August";/
    "September";/
    "October";/
    "November";/
    "December"
% Appropriate date and time representation (%c)
d_t_fmt "%a %d %b %Y %r %Z"
%
% Appropriate date representation (%x)
d_fmt   "%m//%d//%Y"
%
% Appropriate time representation (%X)
t_fmt   "%r"
%
% Appropriate AM/PM time representation (%r)
t_fmt_ampm "%I:%M:%S %p"
%
% Strings for AM/PM
%
am_pm   "AM";"PM"
date_fmt "%F %Z"
END LC_TIME

请让我知道我可以做些什么来获得预期的格式。

注意：我只需要执行date没有任何格式化选项的命令。

command-line locale coreutils date
Martin Hope
Antonio
Asked: 2018-06-01 03:59:42 +0800 CST
  • 0

关于该工具有两个man页面：sync

(1) http://man7.org/linux/man-pages/man1/sync.1.html

NAME         

       sync - Synchronize cached writes to persistent storage

SYNOPSIS         top

       sync [OPTION] [FILE]...

DESCRIPTION         top

       Synchronize cached writes to persistent storage

       If one or more files are specified, sync only them, or their
       containing file systems.

       -d, --data
              sync only file data, no unneeded metadata

       -f, --file-system
              sync the file systems that contain the files

       --help display this help and exit

       --version
              output version information and exit

(2) http://manpages.ubuntu.com/manpages/trusty/en/man8/sync.8.html

NAME
       sync - synchronize data on disk with memory

SYNOPSIS
       sync [--help] [--version]

DESCRIPTION
       sync  writes any data buffered in memory out to disk.  This can include
       (but is not limited to)  modified  superblocks,  modified  inodes,  and
       delayed  reads and writes.  This must be implemented by the kernel; The
       sync program does nothing but exercise the sync(2) system call.

       The kernel keeps data in memory to avoid doing (relatively  slow)  disk
       reads  and  writes.   This  improves  performance,  but if the computer
       crashes, data may be lost or the  filesystem  corrupted  as  a  result.
       sync ensures that everything in memory is written to disk.

       sync  should  be  called  before  the processor is halted in an unusual
       manner (e.g., before causing a kernel panic when debugging  new  kernel
       code).    In   general,  the  processor  should  be  halted  using  the
       shutdown(8) or reboot(8) or halt(8) commands, which will attempt to put
       the  system  in  a  quiescent  state  before calling sync(2).  (Various
       implementations of these commands exist; consult your documentation; on
       some systems one should not call reboot(8) and halt(8) directly.)

第一个来自coreutils，第二个来自fileutils。我尝试sync从 Ubuntu 14.04 中编译该工具，coreutils 8.29但得到的结果与sync(2) 相同。

如何sync在 Ubuntu 14.04 上获得具有功能 (1) 的工具？

filesystem sync coreutils