HTML教程：50Gbit/s光模块与版面编辑

HTML
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"这篇文档是关于HTML的教程，主要涵盖了HTML的基本概念、版面编辑、列表创建、图像处理、超链接、表格制作、动态及多媒体效果、多视窗口框架以及表单设计等内容。" 在HTML中，换行标签`<br>`是一个非常基础的元素，用于在文本中强制换行。在网页显示时，无论`<br>`标签出现在哪里，它后面的内容都会在新的行开始。例如在提供的示例中，诗歌通过`<br>`标签进行了分行显示，使得文本在浏览器中按照预期的格式呈现。 段落标签`<p>`则是用于定义文本段落的，每个`<p>`标签内的文本会被视为一个独立的段落，之间默认会有一行的间距。`<p>`标签可以单独使用，但通常建议成对使用，以保持代码的清晰和规范。此外，`<p>`标签还支持属性`ALIGN`，允许设置段落的对齐方式，包括左对齐（`left`）、居中（`center`）和右对齐（`right`）。在实例中，不同的段落使用了`align`属性来改变其文字的对齐方式，增强了版面布局的灵活性。 HTML文档通常由三部分组成：头部（`<head>`）、主体（`<body>`）和尾部（可选）。头部定义了文档的元信息，如标题（`<title>`），而主体则包含了用户在浏览器中实际看到的内容。HTML标签和属性是描述文档结构和样式的关键，它们指示浏览器如何解析和展示内容。 在后续章节中，文档介绍了如何创建列表（有序或无序列表）、处理图像（`<img>`标签）、建立超链接（`<a>`标签）以及表格的构建。表格是HTML中复杂的数据组织形式，可以通过`<table>`标签及其相关属性如`border`、`rules`、`frame`等来定义表格的外观和行为。表格的行（`<tr>`）、列（`<td>`或`<th>`）以及单元格的合并也是重要概念，它们使得数据的呈现更加有条理。 此外，HTML还能实现动态和多媒体效果，如JavaScript的交互性，以及音频和视频的嵌入。多视窗口框架（`<frameset>`和`<frame>`标签）可以将浏览器窗口划分为多个独立显示区域，每个区域可以加载不同的网页内容。最后，表单设计涉及到`<form>`、`<input>`等标签，用于收集用户输入，常用于在线调查、注册登录等场景。 HTML作为网页的基础语言，其易学性和广泛的兼容性使其成为互联网内容呈现的核心工具。理解并掌握这些基本概念和标签，能帮助开发者创建出功能丰富、布局精美的网页。

基于PAM4调制的400G光模块

2021-02-19 上传
**基于PAM4调制的400G光模块** 400G光模块是数据中心高速网络的关键组件，尤其在PAM4（脉冲幅度调制，Pulse Amplitude Modulation）技术的支持下，实现了数据传输速率的显著提升。PAM4调制允许在一个信号通道中传输...

``` cp /etc/pam.d/su /etc/pam.d/su.bak cp /etc/pam.d/password-auth-ac /etc/pam.d/password-auth-ac.bak cp /etc/pam.d/system-auth /etc/pam.d/system-auth.bak cp /etc/login.defs /etc/login.defs.bak cp /etc/ssh/sshd_config /etc/ssh/sshd_config.bak cp /etc/vsftpd/vsftpd.conf /etc/vsftpd/vsftpd.conf.bak cp /etc/profile /etc/profile.bak cp /etc/motd /etc/motd.bak ```

2023-07-15 上传
1. `cp /etc/pam.d/su /etc/pam.d/su.bak`：备份/etc/pam.d/su文件为/etc/pam.d/su.bak。 2. `cp /etc/pam.d/password-auth-ac /etc/pam.d/password-auth-ac.bak`：备份/etc/pam.d/password-auth-ac文件为/etc/pam.d...

逐条注释 ``` if [ -f "/etc/pam.d/system-auth" ];then if grep -q "password requisite pam_cracklib.so retry=3 minlen=8 minclass=3 ucredit=-1 lcredit=-1 dcredit=-1 ocredit=-1" /etc/pam.d/system-auth then sed -i '/password requisite pam_cracklib.so retry=3 minlen=8 minclass=3 ucredit=-1 lcredit=-1 dcredit=-1 ocredit=-1/s/^#//' /etc/pam.d/system-auth else echo 'password requisite pam_cracklib.so retry=3 minlen=8 minclass=3 ucredit=-1 lcredit=-1 dcredit=-1 ocredit=-1' >> /etc/pam.d/system-auth fi if grep -q "password required pam_unix.so remember=5 use_authtok md5 shadow" /etc/pam.d/system-auth then sed -i '/password required pam_unix.so remember=5 use_authtok md5 shadow/s/^#//' /etc/pam.d/system-auth else echo 'password required pam_unix.so remember=5 use_authtok md5 shadow' >> /etc/pam.d/system-auth fi fi ```

2023-07-15 上传
这段脚本的作用是检查/etc/pam.d/system-auth文件是否存在，并其进行修改或添加配置。具体解释如下： ```shell if [ -f "/etc/pam.d/system-auth" ];then ``` - 检查/etc/pam.d/system-auth文件是否存在。如果存在...

逐条注释 ``` if [ -f "/etc/pam.d/password-auth-ac" ];then if grep -q "password requisite pam_cracklib.so retry=3 minlen=8 minclass=3 ucredit=-1 lcredit=-1 dcredit=-1 ocredit=-1" /etc/pam.d/password-auth-ac then sed -i '/password requisite pam_cracklib.so retry=3 minlen=8 minclass=3 ucredit=-1 lcredit=-1 dcredit=-1 ocredit=-1/s/^#//' /etc/pam.d/password-auth-ac else echo 'password requisite pam_cracklib.so retry=3 minlen=8 minclass=3 ucredit=-1 lcredit=-1 dcredit=-1 ocredit=-1' >> /etc/pam.d/password-auth-ac fi if grep -q "password required pam_unix.so remember=5 use_authtok md5 shadow" /etc/pam.d/password-auth-ac then sed -i '/password required pam_unix.so remember=5 use_authtok md5 shadow/s/^#//' /etc/pam.d/password-auth-ac else echo 'password required pam_unix.so remember=5 use_authtok md5 shadow' >> /etc/pam.d/password-auth-ac fi fi ```

2023-07-15 上传
这段脚本的作用是检查/etc/pam.d/password-auth-ac文件是否存在，并对其进行修改或添加配置。具体解释如下： ```shell if [ -f "/etc/pam.d/password-auth-ac" ];then ``` - 检查/etc/pam.d/password-auth-ac文件...

if [ -f "/etc/pam.d/system-auth" ];then if grep -q "password requisite pam_cracklib.so retry=3 minlen=8 minclass=3 ucredit=-1 lcredit=-1 dcredit=-1 ocredit=-1" /etc/pam.d/system-auth then sed -i '/password requisite pam_cracklib.so retry=3 minlen=8 minclass=3 ucredit=-1 lcredit=-1 dcredit=-1 ocredit=-1/s/^#//' /etc/pam.d/system-auth else echo 'password requisite pam_cracklib.so retry=3 minlen=8 minclass=3 ucredit=-1 lcredit=-1 dcredit=-1 ocredit=-1' >> /etc/pam.d/system-auth fi if grep -q "password required pam_unix.so remember=5 use_authtok md5 shadow" /etc/pam.d/system-auth then sed -i '/password required pam_unix.so remember=5 use_authtok md5 shadow/s/^#//' /etc/pam.d/system-auth else echo 'password required pam_unix.so remember=5 use_authtok md5 shadow' >> /etc/pam.d/system-auth fi fi if [ -f "/etc/pam.d/password-auth-ac" ];then if grep -q "password requisite pam_cracklib.so retry=3 minlen=8 minclass=3 ucredit=-1 lcredit=-1 dcredit=-1 ocredit=-1" /etc/pam.d/password-auth-ac then sed -i '/password requisite pam_cracklib.so retry=3 minlen=8 minclass=3 ucredit=-1 lcredit=-1 dcredit=-1 ocredit=-1/s/^#//' /etc/pam.d/password-auth-ac else echo 'password requisite pam_cracklib.so retry=3 minlen=8 minclass=3 ucredit=-1 lcredit=-1 dcredit=-1 ocredit=-1' >> /etc/pam.d/password-auth-ac fi if grep -q "password required pam_unix.so remember=5 use_authtok md5 shadow" /etc/pam.d/password-auth-ac then sed -i '/password required pam_unix.so remember=5 use_authtok md5 shadow/s/^#//' /etc/pam.d/password-auth-ac else echo 'password required pam_unix.so remember=5 use_authtok md5 shadow' >> /etc/pam.d/password-auth-ac fi fi

2023-07-14 上传
subprocess.call("sed -i '/password requisite pam_cracklib.so retry=3 minlen=8 minclass=3 ucredit=-1 lcredit=-1 dcredit=-1 ocredit=-1/s/^#//' /etc/pam.d/system-auth", shell=True) else: subprocess....

qemu-img create -f qcow2 /opt/vm/rhel-server-7.9-x86_64-dvd.qcow2 100G virt-install --virt-type kvm --name rhel-server-7.9-x86_64-dvd --os-variant generic --ram 8192 --cdrom=/opt/iso/rhel-server-7.9-x86_64-dvd.iso -m 00:0d:30:1c:52:56 --autostart --network bridge=br0 --vcpus 4 --disk=/opt/vm/rhel-server-7.9-x86_64-dvd.qcow2 --graphics vnc,listen=0.0.0.0,port=59180,password=Pam_2022,keymap=en-us --clock offset=localtime --noautoconsole

2023-07-13 上传
- `--vcpus 4`: 指定虚拟机的 CPU 核心数为 4。 - `--disk=/opt/vm/rhel-server-7.9-x86_64-dvd.qcow2`: 指定虚拟机的磁盘镜像文件路径。 - `--graphics vnc,listen=0.0.0.0,port=59180,password=Pam_2022,keymap=en...

python2 查看是否存在下面的文件 "/etc/pam.d/su", "/etc/pam.d/password-auth-ac", "/etc/pam.d/system-auth", "/etc/login.defs", "/etc/ssh/sshd_config", "/etc/vsftpd/vsftpd.conf", "/etc/profile", "/etc/motd"

2023-07-14 上传
"/etc/pam.d/su", "/etc/pam.d/password-auth-ac", "/etc/pam.d/system-auth", "/etc/login.defs", "/etc/ssh/sshd_config", "/etc/vsftpd/vsftpd.conf", "/etc/profile", "/etc/motd" ] for file_path in ...

cat /etc/pam.d/system-auth cat /etc/pam.d/sshd cat /etc/profile cat /etc/passwd 查看密码 cat /etc/shadow cat /etc/group cat /etc/hosts.equiv cat /etc/hosts.rhosts ps aux |grep telnet ps aux |grep rlogin ps aux |grep ftp cat /etc/group cat /etc/ssh/sshd_config umask ls -l /etc/passwd ls -l /etc/group ls -l /etc/shadow ls -l /etc/xinetd.conf ls -l /etc/sudoers ls -l /etc/httpd.conf ls -l /etc/httpd-mpm.conf ls -l /etc/conf/tomcat-users.xml ls -l /etc/conf/web.xml ls -l /etc/conf/server.xml ls -l /etc/my.cnf ls -l /var/mysqllog/logbin.log ps aux | grep syslogd ps aux | grep rsyslogd service syslog status service rsyslog status ps aux | grep audit service auditd status ps aux |grep ssh ls -l /var/log/messages ls -l /var/log/secure ls -l /var/log/audit/audit.log tail -20 /var/log/messages tail -20 /var/log/audit/audit.log tail -n 20 /var/log/messages tail -n 20 /var/log/audit/audit.log cat /etc/logrotate.conf cat /etc/rsyslog.conf auditctl -s auditctl -l lsof -i:21 lsof -i:22 lsof -i:23 这些命令的意思

2023-07-21 上传
1. `cat /etc/pam.d/system-auth`: 显示 `/etc/pam.d/system-auth` 文件的内容，该文件用于管理系统级身份验证和授权。 2. `cat /etc/pam.d/sshd`: 显示 `/etc/pam.d/sshd` 文件的内容，该文件用于管理 SSH 服务的...

python2批量在文件同文件夹下备份为[文件名]+[.bak] ``` /etc/pam.d/su /etc/pam.d/password-auth-ac /etc/pam.d/system-auth /etc/login.defs /etc/ssh/sshd_config /etc/vsftpd/vsftpd.conf /etc/profile /etc/motd ```

2023-07-22 上传
"/etc/pam.d/password-auth-ac", "/etc/pam.d/system-auth", "/etc/login.defs", "/etc/ssh/sshd_config", "/etc/vsftpd/vsftpd.conf", "/etc/profile", "/etc/motd" ] # 遍历文件列表 for file_path in ...

uint32 *flag = param; uint64 var = meas->dvt->hves;// - meas->dvt->lves;//EMU->URMS - EMU->IBRMS; //EMU->URMS;EMU->SPL_U var *= 1000; var += (meas->dvt->ia >> 1); var /= meas->dvt->ia; if(meas->pam->flag == 0x0) { EMU->SPCMD = 0xE5; EMU->EMUCON2 |= 0x7; //使能通道直流offset自动校正 sleep(1500); while(EMU->EMUCON2 & 5); EMU->SPCMD = 0xDC; meas->pam->flag = 0x5555AAAA; meas->pam->ia = EMU->IADCOS ; meas->pam->us = EMU->UDCOS ; meas->pam->ib = EMU->IBDCOS ; } else if(meas->pam->flag == 0x5555AAAA) { meas->pam->r[0] = var; meas->pam->r[1] = flag[1]; meas->pam->flag = 0xaaaaaaaa; } else { uint32 y = flag[1] - meas->pam->r[1]; uint32 x = var - meas->pam->r[0]; meas->pam->gain = (y * 1000 + (x >> 1)) / x; meas->pam->bias = flag[1] * 1000 - var * meas->pam->gain; meas->pam->bias += 500; meas->pam->bias /= 1000; meas->pam->flag = 0x55555555; }解释下这段代码

2023-06-01 上传
接着，判断输入的meas指针中的标志位flag是否为0x0，如果是零则表示需要进行偏移校准，此时会将EMU->SPCMD设为0xE5，表示需要进行通道直流offset自动校正，并等待1.5s让系统完成校准。校准完成后，将标志位flag设置...
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