Ssh Config File Port

SSH server by default listens to port 22 and you don't have to manually specify the port number on your SSH client if you're connecting to the default port. You'll have to manually specify the port number when you're connecting to non-standard SSH ports using the -p option or by adding the port information in your SSH client's configuration file. The ssh program on a host receives its configuration from either the command line or from configuration files /.ssh/config and /etc/ssh/sshconfig. Command-line options take precedence over configuration files. The user-specific configuration file /.ssh/config is used next. Finally, the global /etc/ssh/sshconfig file is used. The first obtained value for each configuration parameter will be used.

What is a CONFIG file?

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A CONFIG file is known as configuration file; used to configure the parameters and primary settings for several computer softwares. The config File format is used for server processes, software applications, and operating system settings. Some softwares only read their configuration files at their startup. Others check the configuration files for changes periodically. A programmer can write code to instruct a software to read the configuration files again and again after certain time of period and apply the changes to the current process. There are no definitive standards or strong conventions for CONFIG file sysntax. For example, Microsoft’s Web.config file is belongs to CONFIG file format, which consists of an XML based tagsets; can be edited with Microsoft Visual Studio or any other text editor.

Examples of configuration files:

Since, the configuration files are not created by following any rules, standrads or conventions, these files might have written by using different formats. A .config file might be based on XML, JSON or any other format. Following are the examples of configuration files for well known operating systems and softwares:

Configuration files in Linux

Every Linux program is an executable file keeping the list of opcodes the CPU executes to accomplish typical operations. The operations of almost every program can be customized to your requirements by changing its configuration files. Several configuration files in the Linux system are in the /etc directory. The configuration files can be classified into the following categories:|Category|Example| Comments|—|—|—||Access files|/etc/host.conf|Tells the network domain server how to look up hostnames.||Booting and login/logout|/etc/rc.d/rc.local|Not official. May be called from rc, rc.sysinit, or /etc/inittab.||File system|/etc/mtools.conf|Configuration for all the operations (mkdir, copy, format, etc.) on a DOS-type filesystem.||System administration|/etc/shells|Holds the list of possible “shells” available to the system.||Networking|/etc/gated.conf|Configuration for gated. Used only by the gated daemon.||System commands|/etc/logrotate.conf|Configuration for the Dynamic Linker.||Daemons|/etc/httpd.conf|The configuration file for Apache, the Web server. This file is typically not in /etc.||User programs| /etc/lynx.cfg| Proxy settings|

AWS CONFIG file example

The frequently used configuration settings and credentials can be saved in CONFIG files that are maintained by the AWS CLI. The CONFIG file must be a plaintext file that uses the following format: