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Sun, 11 Jul 2021 07:07:00 GMT

摘要: Linux下删除大量文件主要参考了http://www.slashroot.in/which-is-the-fastest-method-to-delete-files-in-linux首先建立50万个文�g�? test for i in $(seq 1 500000);do echo text >>$i.txt;done 1. rm�?.. 阅读全文

聂文�?/a> 2021-07-11 15:07 发表评论

��止 .mysql_history

Sun, 25 Mar 2018 10:18:00 GMT

$find / -name .mysql_history
或者进入主目录�Q?nbsp;
$cd $HOME
$find . -name .mysql_history

$cat /dev/null > ~/.mysql_history

通常情况�?�Q�数据库��理员都是很��秘的，因�ؓ他们�l�常几个语句��搞定了数据库查询缓慢的问题�Q�让��Z��非常佩服�Q�但是熟悉mysql的朋友都知道mysql 在当前用��L��家目录下会有�?.mysql_history 文�g�Q�其中保存着�q�去执行�q�的mysql命��o�Q�通过�q�个命��o你就能知道他刚才执行了什么语句。这也是我熟悉mysql的学习的一个有力工兗��?/span>

但是当你若是一个数据库��理员时�Q�你��p��考虑下这个问题了。因��Z��执行的某些语句是不希望别人看到的。例如定期修�Ҏ��据库��用户root的密码�?�q�样别�h只要有此文�g的读取权限，那么数据库就没有安全可言了�?怎么�?可以通过讄�� 关闭�q�个�?/span>

�Ҏ��如下

首先 �?etc/profile 中添�?/span>

export MYSQL_HISTFILE=/dev/null

保存退出后

在terminal 中执�?/span> ln -s /dev/null ~/.mysql_history

��现有的文�g删除

rm ~/.mysql_history

ls -al ~/lrwxrwxrwx. 1 root root 9 1�? 3 23:14 .mysql_history -> /dev/null

��x��Q�以�? 你在mysql中执行的命��o��׃��会被记录了�?/span>

聂文�?/a> 2018-03-25 18:18 发表评论

Debian �pȝ��退出时清除相关记录

Sun, 25 Mar 2018 10:10:00 GMT

Last login: Sun Mar 25 17:44:20 on ttys003

MACdeiMac-2:~ MAC$ sudo -s

Password:

bash-3.2# ssh -p 3389 xxx.xxx.xxx.xxx

Linux localhost 3.2.0-4-amd64 #1 SMP Debian 3.2.88-1 x86_64

The programs included with the Debian GNU/Linux system are free software;

the exact distribution terms for each program are described in the

individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent

permitted by applicable law.

Last login: Sun Mar 25 16:41:05 2018 from xxx.xxx.xxx.xxx

root@localhost:~# cat /etc/skel/.bash_logout

# ~/.bash_logout: executed by bash(1) when login shell exits.

# when leaving the console clear the screen to increase privacy

if [ "$SHLVL" = 1 ]; then

[ -x /usr/bin/clear_console ] && /usr/bin/clear_console -q

# add by me remove history files when logout.

rm -f $HOME/.bash_history

root@localhost:~# cat /etc/skel/.bash

.bash_logout .bashrc

root@localhost:~# cat /etc/skel/.bashrc

# ~/.bashrc: executed by bash(1) for non-login shells.

# see /usr/share/doc/bash/examples/startup-files (in the package bash-doc)

# for examples

# If not running interactively, don't do anything

case $- in

*i*) ;;

*) return;;

esac

# don't put duplicate lines or lines starting with space in the history.

# See bash(1) for more options

HISTCONTROL=ignoreboth

# append to the history file, don't overwrite it

shopt -s histappend

# for setting history length see HISTSIZE and HISTFILESIZE in bash(1)

HISTSIZE=1000

HISTFILESIZE=2000

# check the window size after each command and, if necessary,

# update the values of LINES and COLUMNS.

shopt -s checkwinsize

# If set, the pattern "**" used in a pathname expansion context will

# match all files and zero or more directories and subdirectories.

#shopt -s globstar

# make less more friendly for non-text input files, see lesspipe(1)

#[ -x /usr/bin/lesspipe ] && eval "$(SHELL=/bin/sh lesspipe)"

# set variable identifying the chroot you work in (used in the prompt below)

if [ -z "${debian_chroot:-}" ] && [ -r /etc/debian_chroot ]; then

debian_chroot=$(cat /etc/debian_chroot)

# set a fancy prompt (non-color, unless we know we "want" color)

case "$TERM" in

xterm-color) color_prompt=yes;;

esac

# uncomment for a colored prompt, if the terminal has the capability; turned

# off by default to not distract the user: the focus in a terminal window

# should be on the output of commands, not on the prompt

#force_color_prompt=yes

if [ -n "$force_color_prompt" ]; then

if [ -x /usr/bin/tput ] && tput setaf 1 >&/dev/null; then

# We have color support; assume it's compliant with Ecma-48

# (ISO/IEC-6429). (Lack of such support is extremely rare, and such

# a case would tend to support setf rather than setaf.)

color_prompt=yes

else

color_prompt=

if [ "$color_prompt" = yes ]; then

PS1='${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ '

else

PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w\$ '

unset color_prompt force_color_prompt

# If this is an xterm set the title to user@host:dir

case "$TERM" in

xterm*|rxvt*)

PS1="\[\e]0;${debian_chroot:+($debian_chroot)}\u@\h: \w\a\]$PS1"

;;

esac

# enable color support of ls and also add handy aliases

if [ -x /usr/bin/dircolors ]; then

test -r ~/.dircolors && eval "$(dircolors -b ~/.dircolors)" || eval "$(dircolors -b)"

alias ls='ls --color=auto'

#alias dir='dir --color=auto'

#alias vdir='vdir --color=auto'

#alias grep='grep --color=auto'

#alias fgrep='fgrep --color=auto'

#alias egrep='egrep --color=auto'

# some more ls aliases

#alias ll='ls -l'

#alias la='ls -A'

#alias l='ls -CF'

# Alias definitions.

# You may want to put all your additions into a separate file like

# ~/.bash_aliases, instead of adding them here directly.

# See /usr/share/doc/bash-doc/examples in the bash-doc package.

if [ -f ~/.bash_aliases ]; then

. ~/.bash_aliases

# enable programmable completion features (you don't need to enable

# this, if it's already enabled in /etc/bash.bashrc and /etc/profile

# sources /etc/bash.bashrc).

if ! shopt -oq posix; then

if [ -f /usr/share/bash-completion/bash_completion ]; then

. /usr/share/bash-completion/bash_completion

elif [ -f /etc/bash_completion ]; then

. /etc/bash_completion

root@localhost:~# vi /etc/skel/.bashrc

root@localhost:~#

聂文�?/a> 2018-03-25 18:10 发表评论

Tue, 27 Feb 2018 17:40:00 GMT

openssl 别�h�~�译的下�?�Q�https://www.npcglib.org/~stathis/blog/precompiled-openssl/

http://blog.csdn.net/liang19890820/article/details/51658574

http://blog.csdn.net/ljttianqin/article/details/72978612

OpenSSL�~�译(Win7,64�?VS2010)

�pȝ��环境

操作�pȝ��Q�Windows 7专业版（SP1�Q?/p>

�pȝ��c�d��Q?4位操作系�l?/p>

�~�译环境

Microsoft Visual Studio 2010

下蝲

OpenSSL

下蝲地址�Q?a target="_blank" style="color: #1e375a; outline: 0px; margin: 0px; padding: 0px; box-sizing: border-box; text-decoration-line: none;">http://www.openssl.org/source

ActivePerl

下蝲地址�Q?a target="_blank" style="color: #1e375a; outline: 0px; margin: 0px; padding: 0px; box-sizing: border-box; text-decoration-line: none;">http://downloads.activestate.com/ActivePerl

安装�Q�没啥好说的

�~�译步骤

启动Microsoft Visual Studio 2010 => Microsoft Visual Studio 2010 =>Visual Studio x64 Cross Tools Command Prompt (2010)
cd 到OpenSSL的下载�\径例如（cd D:\adobe_study\openssl-1.0.1e)
按照OpenSSL下蝲目录中的"INSTALL.W64"文�g�Q��用文本工��h��开�Q�例如UE�Q�里提示的命�?如下)逐步�q�行操作�?/p>
> perl Configure VC-WIN64A
> ms\do_win64a
> nmake -f ms\ntdll.mak
> cd out32dll
> ..\ms\test

补充

�~�译Debug版本(xxxMDd.lib)

a.修改ms\do_win64a

perl util\mk1mf.pl VC-WIN64A >ms\nt.mak => perl util\mk1mf.pl debug VC-WIN64A >ms\nt.mak

perl util\mk1mf.pl dll VC-WIN64A >ms\ntdll.mak => perl util\mk1mf.pl debug dll VC-WIN64A >ms\ntdll.mak

b.修改ms\ntdll.mak

SSL=ssleay32 => SSL=ssleay32MDd

CRYPTO=libeay32 => CRYPTO=libeay32MDd

c.修改ms\libeay32.def —— LIBRARY LIBEAY32 => LIBRARY LIBEAY32MDd

d.修改ms\ssleay32.def —— LIBRARY SSLEAY32 => LIBRARY SSLEAY32MDd

e.�q�行 > nmake -f ms\ntdll.mak

2. �~�译Debug版本(xxxMTd.lib)

a.修改ms\nt.mak

SSL=ssleay32 => SSL=ssleay32MTd

CRYPTO=libeay32 => CRYPTO=libeay32MTd

b.�q�行 > nmake -f ms\nt.mak

聂文�?/a> 2018-02-28 01:40 发表评论

Mon, 29 Jan 2018 20:55:00 GMT

#include
#include
#include <string.h>
#include
int main() {
    int i,v;
    char bs[33];
    char b[33];
    char hs[9];
    char h[9];
    char s[4];
    char *e;

// 十进制整数�{二进制串�Q?/span>
    i=1024;
    ltoa(i,b,2);
    sprintf(bs,"%032s",b);
    printf("i=%d,bs=%s\n",i,bs);
// 十进制整数�{十六�q�制�Ԍ��
    i=1024;
    ltoa(i,h,16);
    sprintf(hs,"%08s",h);
    printf("i=%d,hs=%s\n",i,hs);
// 十六�q�制字符串�{成十�q�制�?/span>
    strcpy(hs,"00000400");
    sscanf(hs,"%x",&i);
    printf("hs=%s,i=%d\n",hs,i);
// 二进制字�W�串转化为十六进制字�W�串�Q?/span>
    strcpy(bs,"00000000000000000000010000000000");
    i=strtol(bs,&e,2);
    ltoa(i,h,16);
    sprintf(hs,"%08s",h);
    printf("bs=%s,hs=%s\n",bs,hs);
// 二进制字�W�串转化为十�q�制敎ͼ�
    strcpy(bs,"00000000000000000000010000000000");
    i=strtol(bs,&e,2);
    printf("bs=%s,i=%d\n",bs,i);
// 十六�q�制字符串�{成二�q�制�?/span>
    strcpy(hs,"00000400");
    sscanf(hs,"%x",&i);
    ltoa(i,b,2);
    sprintf(bs,"%032s",b);
    printf("hs=%s,bs=%s\n",hs,bs);
// ASC\GBK字符串�{十六�q�制�?/span>
    strcpy(s,"a�?);
    i=0;
    while (1) {
        if (0==s[i]) break;
        sprintf(hs+i*2,"%02X",(unsigned char)s[i]);
        i++;
    }
    setlocale(LC_ALL,"chs");
    printf("s=%s,hs=%s\n",s,hs);
// 十六�q�制字符串�{成汉字（GBK�Q�及字符(ASC)
    strcpy(hs,"61BABA");
    i=0;
    while (1) {
        if (1!=sscanf(hs+i*2,"%2x",&v)) break;
        s[i]=(char)v;
        i++;
    }
    s[i]=0;
    printf("hs=%s,s=%s\n",hs,s);

    return 0;

}
//i=1024,bs=00000000000000000000010000000000
//i=1024,hs=00000400
//hs=00000400,i=1024
//bs=00000000000000000000010000000000,hs=00000400
//bs=00000000000000000000010000000000,i=1024
//hs=00000400,bs=00000000000000000000010000000000
//s=a�?hs=61BABA
//hs=61BABA,s=a�?/span>

聂文�?/a> 2018-01-30 04:55 发表评论

Tue, 16 Jan 2018 15:05:00 GMT

Poco C++库是�Q?/span>

一�p�d��C++�c�d��Q�类似Java�c�d��Q?Net框架�Q�Apple的Cocoa;
侧重于互联网时代的网�l�应用程�?/li>
使用高效的，��C��的标准ANSI/ISO C++�Q��ƈ��Z��STL
高可�U�d��性，�q�可在多个��^��C��可用
开源，�q��用Boost Software License发布
不管是否商用�Q�都完全免费

Poco库概�?/span>

�Ҏ��：

DynamicAny与Any�c?/li>
Cache框架
��Z��OpenSSL的密码系�l?/li>
日期�Q�时间类�?/li>
事�g和通知框架
FTP客户�?/li>
跨��^台的文�g�pȝ��c�d��
HTML表单�c�d��
HTTP客户端和服务端（支持SSL�Q�，C++ 服务器页面编译器
日志框架
多线�E�框�Ӟ��U�程池，�z�d��对象�Q�工作队列等�Q?/li>
POP3客户端类�?/li>
跨��^収ͼ�一�ơ编写，多��^台编译和�q�行
�q�程��理和进�E�间通信�c�d��
反射框架
��Z��PCRE的正则表辑ּ�
SMTP客户端类�?/li>
数据库访问类库（SQLite,MySQL, ODBC)
支持SSL/TLS�Q�基于OpenSSL
动态类库加�?/li>
先进的内存和指针��理�Q�Buffer, Pool�Q?/li>
Socket�c�d��
�|�络数据��类库，支持Base64,HexBinary�~�解码，压羃�{�等
字符串格式化和其它字�W�串工具�c�d��
TCP服务器框�Ӟ��多线�E�）
文本�~�码和�{�?/li>
Tuples
URI支持
支持UTF8和Unicode�~�码
UUID生成�?/li>
XML生成和解析器
Zip文�g操作�c�d��

Poco的��?/span>

Poco是一个强大的�c�d��Q��ƈ易于构徏自己的应用程�?/li>
Poco帮助你创��q�_��的应用程序（一�ơ编写，多��^台编译和�q�行�Q?/li>
模块化和可扩展，可应用于嵌入式到企业�U�程�?/li>
提供全面�Q�易懂的�~�程接口
使用C++语言�Q�快速且高效
Poco崇尚��?/li>
在设计，代码风格和文档上保持一�?/li>
Poco��代码质量�Q�包括可��L��，�l�合性，一致性，�~�码风格和可��试�?/li>
Poco使得C++�~�程更加�Ҏ��

指导斚w��

高度��x��代码质量�Q�编码风��|��一致性，可读�?/li>
高度��x��试
注重实用�?/li>
��Z��现有的，可靠的组件开�?/li>

版本历史

Summer 2004: Günter Obiltschnig started development
February 2005: First release on SourceForge
(Release 0.91 under Sleepycat license)
May 2005: First contributions by Aleksandar Fabijanic
January 2006: Release 1.0
March 2006: Release 1.1
July 2006: Moved to Boost license, POCO Community Website
August 2006: Release 1.2
May 2007: Release 1.3
July 2010: Stable Release 1.3.7,
about 20 contributors, used in 100s of projects

支持�q�_��

Microsoft Windows
Linux
Mac OS X
HP-UX, Solaris, AIX*
Embedded Linux (uClibc, glibc)
iOS
Windows Embedded CE
QNX

Poco应用场景

创徏自动化的中间件和讑֤�
工业自动化和工业讑֤�
��量控制�pȝ��
健康�pȝ��
��量�Q�数据收集和��试�pȝ��
消费电子产品和家庭自动化产品
��量
航空交通管理系�l?/li>
VoIP
��务和入口控制系�l?/li>
包装应用�E�序

Poco的优�?/span>

全面的，完整的C++框架�Q�可减少开发工作，快速让产品走向市场
易学易��用，以及相当多的�C�Z��代码和良好的文档
原生的C++代码�Q�性能优秀�Q�低内存占用
�q�_��无关�Q�一处编写，跨��^台编译和�q�行
- 大多数情况下�Q�可以开发机上完成开发和调试工作
- 可以非常�Ҏ��的迁�U�d��新��^�?/li>

�~�译

�?vs2008 ��Z��:

Poco 根目录下�?/p>

build_vs90.cmd

buildwin.cmd

�q�两个批处理文�g, 我们得修改一下它�?/p>

把build_vs90.cmd 修改��Z��下内�?

@echo off
if defined VS90COMNTOOLS (
call "%VS90COMNTOOLS%\vsvars32.bat")
buildwin 90 build all both Win32 samples

如果你不需�? NetSSL_OpenSSL �?nbsp;MySQL ,此时保存后就双击它就行了. 它会自动�~�译好各�U�库.

如果你要NetSSL_OpenSSL �q�个�?你必��?

在buildwin.cmd 中的38�?讄�� openssl 的�\�? 它默认在C:\OpenSSL. 可以修改�?你的路径.

如果你要 Poco 中的 MySQL �?你还得安�? Mysql

关于 OpenSSL �?Mysql 库的的安装包

OpenSSL:

在这里下载一个安装包

http://slproweb.com/products/Win32OpenSSL.html

注意Light 是没有开发包�? 有x64 和x32 之分, x32 �?4位windows下也可以完全正常工作. 如果要编译poco的话我徏议用x32.

不要下蝲d�l�尾的，d�l�尾的缺��部分dll�Q�下载k�l�尾的例如Win32OpenSSL-1_0_2k.exe

mysql:

http://www.mysql.com/downloads/connector/c/

�q�个也有x32 和x64之分.一般下载x32的就可以�?

关于x32和x64 :

Poco 默认是x32�? 所以我们的 OpensSSL �?Mysql 也必��M��?x32�?

聂文�?/a> 2018-01-16 23:05 发表评论

Sat, 06 Jan 2018 16:58:00 GMT

有如下几�U�方法：

#include 〈iostream�?br style="content: ""; display: block; width: 700px; height: 0px; margin: 20px 0px;" />
#include 〈list�? 

#include 〈bitset�? 

using namespace std; 



1.//递归输出二进制函�?br style="content: ""; display: block; width: 700px; height: 0px; margin: 20px 0px;" />
void BinaryRecursion(int n)

{  

int a;  

a=n%2;  

n=a;  

if (n==0)

return;  

else  

BinaryRecursion(n);  

cout〈〈a;  

} 



2.//使用容器转换二进�?/a>  

void BinaryVector(int n)  

{  

int temp;  

temp=n;  

list〈int�?L;  

while(temp!=0)  

{  

L.push_front(temp%2);  

temp=temp〉�?;  

}  

for (list〈int�?:iterator iter=L.begin();iter!=L.end();iter++ )  

cout〈�?iter;  

cout〈〈endl;  

} 



3.//一般方法，32位，逐步�?做与�q�算�? 

void Binarycout(int n)  

{  

for (int i=31;i�?0;i--)  

{  

cout〈�?(n〉〉i)&1);  

}  

cout〈〈endl;  

} 



4.//使用bitset转换二进�?/a>  

void BinaryBitset(int n)  

{  

cout〈〈bitset〈sizeof(int)*8�?n)〈〈endl;  

}  

int main()  

{  

int a=1045,b=2;  

int c;  

c=a+b;  

cout〈�?BinaryRecursion(c)�Q?;  

BinaryRecursion(c);  

cout�?BinaryVector(c);  

cout〈�?Binarycout(c):";  

Binarycout(c);  

cout〈�?BinaryBitset(c):";  

BinaryBitset(c);  

cout〈�?BinaryChar(c):";  

BinaryChar(c);  

//cout�?return 0;  

}

输出没有直接昄���二进制的 ,能通过其他库函数�{换一�?/span>



int decimal = 200;

char binary[255];

itoa(decimal, binary, 2);

cout << binary;

@import url(http://www.shnenglu.com/CuteSoft_Client/CuteEditor/Load.ashx?type=style&file=SyntaxHighlighter.css);@import url(/css/cuteeditor.css);

聂文�?/a> 2018-01-07 00:58 发表评论

protobuf map

Sat, 06 Jan 2018 10:09:00 GMT

摘要: ��d��protobuf一些文档，写点东西�Q�权作记忆。https://github.com/google/protobuf/blob/master/CHANGES.txt�Q�google发布了protobuf v3�Q��ؓ了pb更好用，更跨语言�Q�他对protobuf v2做了以下change�Q?nbsp; 1. Removal of field presence logic fo... 阅读全文

聂文�?/a> 2018-01-06 18:09 发表评论

MariaDB 密码认证无效的一个坑

Sat, 30 Dec 2017 08:04:00 GMT

MariaDB root 账户默认使用�?UNIX_SOCKET 插�g�Q�只允许 root 用户�q�接�Q�无需密码�?nbsp;

可以使用 root 用户�q�接后创建新用户或者执行：
update mysql.user set plugin = '' where User='root';
flush privileges;
or
update mysql.user set plugin = 'mysql_native_password' where User='root';
flush privileges; @import url(http://www.shnenglu.com/CuteSoft_Client/CuteEditor/Load.ashx?type=style&file=SyntaxHighlighter.css);@import url(/css/cuteeditor.css);

聂文�?/a> 2017-12-30 16:04 发表评论

Wed, 20 Dec 2017 05:39:00 GMT

chromium 代理完美解决办法

#git的代理设�|?/span>

git config --global http.proxy http://127.0.0.1:1080

git config --global https.proxy https://127.0.0.1:1080

#winhttp的代理设�|?/span>

netsh winhttp set proxy 127.0.0.1:1080

#cipd_client��目来源与https://github.com/luci/luci-go/tree/master/cipd/client/cipd

使用的是golong的net/http库访问http/https�Q�可通过环境变量讄��代理

set HTTP_PROXY=http://127.0.0.1:1080
set HTTPS_PROXY=https://127.0.0.1:1080

聂文�?/a> 2017-12-20 13:39 发表评论

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