Ssh Command Examples

Python, Paramiko SSH, and Network Devices (2014-01-23) For various reasons, this Expect-like method is problematic—for example, there can be timing issues; there can be unexpected interaction problems; and there can be variations in device output (between OS versions, between device models, between device types, etc. " It is similar to the standard Unix command, cp, but it operates over a secure network connection. The SCP or Secure copy command is a method of encrypting the transmission of files between systems. SSH provides two different commands, which can be used to accomplish this. A big collection of Unix/Linux 'find' command examples | alvinalexander. For example, you can define a sequence of commands, and run them as a task. DESCRIPTION: Using top level cli commands on the Sonicwall via ssh using Putty. knife ssh¶ [edit on GitHub] Use the knife ssh subcommand to invoke SSH commands (in parallel) on a subset of nodes within an organization, based on the results of a search query made to the Chef Infra Server. To configure your Pi to allow passwordless SSH access with a public/private key pair, see the passwordless SSH guide. [email protected] (SSH login) [email protected]> sudo passwd root [email protected]> su root [email protected]> ssh-keygen -t rsa (without passphrase, in default folder) [email protected]> cd. See 'aws help' for descriptions of global parameters. Example: ls > directory. A linux command line cheat sheet. ps command displays information about a selection of the active processes. Connecting via SSH. 1 if needed). NET, POSH is a full-featured task automation framework for distributed Microsoft platforms and solutions. It also comes with a good documentation with lots of samples on how to use it. PuTTY is an application with which Windows users can connect to their hosting accounts through SSH and execute commands, transfer files, etc. 5) How to Run the Command on a Remote Linux System Over SSH With Non-Standard Port. As we all know that, ssh is for getting into the node and fire some commands and give output for that command. I need help in automation of ssh. Command mode commands which cause action to be taken on the file, and Insert mode in which entered text is inserted into the file. This command, like many commands in the Cisco world does not display if it is in the default configuration. This syntax is useful for console programs that require interactive user command input while they run, and that do not run correctly. Bitvise SSH Client: Graphical and command-line file transfer, terminal, and tunneling. An easy to follow guide of command commands in SSH or linux shell commands, with an explination of what they are used for and an example of their use. For example, the first pssh command below will execute the date command on p1 and p2 as the ben user. There are flags to preserve permissions, ownerships, groups, symlinks, and so on. I am trying to send commands automatically so that it will fire commands and give me the output of it. # Use Yellowdog Updater, Modified (YUM) # to initialize an install of mssql-tools # package sudo ACCEPT_EULA=Y yum install mssql-tools -y -q. In this tutorial we'll show you how to transfer files from your local computer to your hosting account and vice versa through SSH (Secure Shell) using PuTTY. Throughout the testing, window repositioning, scrolling, and window resizing used lots of bandwidth and generated a large number of packets per second. You use the expect command to match the output and decide what to send the current process. This example first performs a checkout and switches to the branch. org -4 The authenticity of host '[gerrit. In the previous post, we talked about sed command and we saw many examples of using it in text processing and we saw how it is good in this, but it has some limitations. Sshpass runs ssh in a dedicated tty, fooling it into thinking it is getting the password from an interactive user. This is a login shell for SSH accounts to provide restricted Git access. Code: var hostKey ssh. A collection of Unix/Linux find command examples, including combining find with grep to search for files and directories, using regular expressions and patterns. For example: $ semanage port -a -t ssh_port_t -p tcp 2345 #Change me. It also comes with a good documentation with lots of samples on how to use it. We should consider some solution to avoid this problem like use SSH options and put in background or use one of the most useful utility in the command line world: screen :). PowerTCP SSH and SFTP and SFTP for. That 10 minute hack command line script, nuget package, third party command line tool saved you 1 hour 3 years ago will cost my team today days or weeks of diagnosis, troubleshooting and rework. Pine or Midnight Commander) on the SSH server. For example, if the server accepts connections on port 7777, you’d run: ssh [email protected] There are four basic ways to use sftp, and the command syntax for each is listed here. ssh/config file in your home directory on the computer that runs the ssh command. Home » Scripts » Expect Script SSH Example Tutorial Expect script is a great linux/unix utility. One of the fundamental differences that we will discuss below is its object orientation – it reads input from a pipe and outputs objects (not text) to a pipe. Previously, we published this kind of brief guide on some of the frequently used GNU/Linux commands like echo, unix pipeline or this can be a better example. It also shows how to exclude multiple files or folders. Change the host aspen to your remote host. In OpenSSH, remote SSH port forwardings are specified using the -R option. Author Topic: Ubiquiti UniFi SSH Commands (Read 84203 times). You can give multiple keys on the command line if you have several identities, so you can have ssh -i ~/. That's not very scary, though. Runs a command on a remote machine running SSH daemon. Here's how to use the secure copy command, in conjunction with ssh key authentication, for an even more secure means of copying files to your remote Linux servers. You may wish to consult man ssh, and the section devoted to the -R option for additional details. com, type the following text in the public key field: "AbcCbaxxx…Example" mandatory (Optional) A clause that indicates whether the COPY command should fail if the connection attempt fails. This means you can copy files between computers, say from your Raspberry Pi to your desktop or laptop, or vice-versa. dat from current directory to the /var/tmp. Examples be done by using option -c blowfish in the command. How to Use SSH Commands in Windows 10 Command Prompt January 15, 2019 Updated March 21, 2019 By Alain Francois LINUX HOWTO In many cases, to manage your Linux servers, you can need to allow remote access and this can be done via the Secure Shell (SSH). In this example, I’m using nc command. In the case of the Access SSH flow, we proxy SSH traffic through Cloudflare by running the Argo Tunnel client, cloudflared, on both the server and the end user’s laptop. NET SSH · C# SFTP · VB. (C#) SSH Execute Remote Commands. X11 connections and arbitrary TCP ports can also. Visualizing Key Fingerprints. ssh/id_dsa 10. In the previous post, we talked about sed command and we saw many examples of using it in text processing and we saw how it is good in this, but it has some limitations. Welcome to Paramiko!¶ Paramiko is a Python (2. SFTP command is session based, whereas, SCP is a single copy command. , read, write and execute) for that object. org -4 The authenticity of host '[gerrit. The chown command is used to change the owner and group of files, directories and links. If you want to stop a brute force attack, then don't allow access to the SSH port. Some servers may restrict the traceroute command. Before We Start. Step number 6 has an example on how to actually run a command on remote host via SSH. Example: pwd. Unlike rcp, scp will ask for passwords or passphrases if they are needed for authentication:. Anyway I want to update this record based on published data from previous entry, is there any work around to get it updated. To remotely execute a command from the local machine, append an instruction to the SSH command. Multixterm Examples. If you clone your repository using this option and then delete branches (or use any other Git command that makes any existing commit unreferenced) in the source repository, some objects may become unreferenced (or dangling). ps command displays information about a selection of the active processes. For more examples without a site profile, check the help file topic 'command line' from within Core FTP. The scp command uses the ssh command and they are very much alike. In order to keep your connection is secure as possible, a number of techniques have been developed to keep what you’re doing private. Use the General page of the SSH Execute Task Editor dialog to configure the parameters needed to run a command on a remote SSH server. Example: cd /home (moves you into the home folder) 3) The same directory. Ansible, by default, assumes we're using SSH keys. For example, if you would like to check a Mac's process activity by using the "top" command, you would perform the following steps in the Terminal: Run the command "ssh [email protected]" to log in to the system. It takes a Day 1 approach to SSH. To make an SSH connection, for example:. With FTP, you can upload/download files and directories. These methods are described below in order from most secure to least secure. They are extracted from open source Python projects. Commands run from a SSH session (such as PuTTY) self-terminate when the SSH session ends, making it difficult to run traffic captures or debugs for long periods of time. SSH and Meterpreter Pivoting. 17 Bash History Command Examples In Linux Posted by Jarrod on October 5, 2016 Leave a comment (3) Go to comments The 'history' command available in Bash can be used to simply display your shell history, however there's also a whole lot more that you can do with it, which we'll demonstrate here. If you observe above command, it is similar to regular SSH command with minor difference. The secure shell interface (SSH) uses a command line interface that allows you type commands to manipulate and view your server files. The command to run is specified after sshpass' own options. bashrc_custom:. I have to deal with a lot of unix servers in my daily life, whether it’s at work or it’s my hosting server. This rsync example sends folder contents to a remote server using ssh. This is where awk command comes in. Example 1: Simple SSH session to a Cisco router; execute and return the 'show ip int brief' command. See 'aws help' for descriptions of global parameters. How to Use SSH Commands in Windows 10 Command Prompt January 15, 2019 Updated March 21, 2019 By Alain Francois LINUX HOWTO In many cases, to manage your Linux servers, you can need to allow remote access and this can be done via the Secure Shell (SSH). They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own. pub file to the remote server you want to be able to access with ssh and/or scp without using a password. In a single Windows application, it provides loads of functions that are tailored for programmers, webmasters, IT administrators and pretty much all users who need to handle their remote jobs in a more simple fashion. The idea is to use ProxyCommand to automatically execute ssh command on remote host to jump to the next host and forward all traffic through. Some servers may restrict the traceroute command. Using SSH can be a superior way to manage the files and databases on your account. PowerShell remoting over SSH relies on the authentication exchange between the SSH client and SSH service and doesn't implement any authentication schemes itself. 4+) implementation of the SSHv2 protocol , providing both client and server functionality. cURL supports various protocols, such Hosting Solutions. This does not have to be the box you are ssh-ing to!). The SSH protocol extends beyond the basic ssh command. when I am behind firewalls. Sometimes you just need to run a command on a remote host with ssh and Python 3 without any real fuss. Type yes and then press ENTER. you might make it so that the command looked something like this:. 這是個有點有趣的小技巧,你可以透過"ctrl-a c"來開啟一個新的SSH連線視窗,然後透過"ctrl-a a"來切換前後兩個不同的ssh連線,然後透過"ctrl-a d"來斷開目前這個SSH的連線,這應該是在你用console連線ssh的時候比較用得到的技巧,畢竟6個console如果都拿來連不同的ssh,那如果要用到第七個怎麼辦?. , aren't *), the command will be run when either field matches the current time. For example, if the remote host's public key is ssh-rsa AbcCbaxxx…Example [email protected] How to Use the Command Line: Basic Requirements The command line is intended to be used with Unix-like distributions such as Linux. This ensures that even if the data is intercepted, it is protected. We can use system variable called TMOUT to set this timeout for your shell script. Use the subprocess module instead. Everyday Recipe Examples. If it's a unix server, then normally you would need to edit ~/. Note that, while this may be useful from time to time, it may not be a full replacement for a regular VPN. Once you have verified that your site profile connects and lists the remote directory correctly from within the GUI, you can then be assured that command line transfers will work with your site profile. After completing installation, open command window and then run ssh; If you want a GUI ssh client you can use Putty. To use Excel VBA, a command line window needs to be run. For example, imagine having to type the following each time you wanted to connect: [[email protected] ~]$ ssh -p 2222 -2 -c blowfish-cbc,aes256-cbc [email protected] Syntax : ssh [email protected] Address of the Remote Computer. tcpdump 'tcp[13] = 6'. You can do so using an SSH connection. The basic command you should use is: ssh [email protected] The commands module contains wrapper functions for os. Invoking SSH commands using powershell (kinda) June 30th, 2015 alanvanwyk Leave a comment Go to comments Sometimes, you need to fire SSH commands from a Powershell session. Please reference the owner's manual to confirm what commands you should run to perform a specific task. key_pair_file " command. When I try to run the same command using remote ssh application such as PuTTy, it works. from the local host. sftp uses underlying ssh access for authentication and after you establish passwordless ssh access you will have passwordless sftp access a s well. Being able to reach out and run commands on systems anywhere in the world has always fascinated me. The exit status is immediately returned to the status variable. To remotely execute a command from the local machine, append an instruction to the SSH command. Modes of Access. The escape character must always follow a newline to be interpreted as special. It uses SSH for data transfer, and uses the same authentication and provides the same security as SSH. I am trying to send commands automatically so that it will fire commands and give me the output of it. In this article you will find the examples of how to execute a remote command, multiple commands or a Bash script over SSH between remote Linux hosts and get back the output (result). 101-xc -- The optional -xc argument indicates a command to be run in each named xterm (see -xn). This command is exactly the same as the first tunnel command we saw, namely. The escape character can be changed in configuration files using the EscapeChar configuration directive or on the command line by the -e option. Single Command Example Here’s a simple example that runs a single command on a remote host using the Golang crypto SSH library. Code: var hostKey ssh. For more examples without a site profile, check the help file topic 'command line' from within Core FTP. com on port 2222, a command like this would be used: % ssh -p 2222 [email protected] Let’ s discuss about it. To use SSH, the destination machine should have a SSH server application installed because SSH is a client-server model. I have to deal with a lot of unix servers in my daily life, whether it’s at work or it’s my hosting server. How To Manage Databases With Command Line SSH. ssh directory in your HOME directory. Note: In the preceding command example, two colons separate the Cygwin server IP address from the module name/path. com's password: ***** Once the tunnel is up and running, point the email client to send POP3 requests to localhost on port 2110. Configuring an action for remote commands is similar to that for sending a message, the only difference being that Zabbix will execute a command instead of sending a message. This article is an introduction to finding your way around your server in SSH. com -p 7777. The tool on Linux for connecting to a remote system using SSH is called, unsurprisingly, ssh. For example: $ semanage port -a -t ssh_port_t -p tcp 2345 #Change me. With SSH you can manage your phone, its files, and correct all sorts of problems. Let’s take an example, $ ncat 192. When the SSH Component is used as a Producer (. As we all know that ssh is used to take remote console of other linux system securly, So let’s take remote console of pc2 from pc1 you can use below ssh command. » SSH client usage Vagrant will attempt to use the local SSH client installed on the host machine. They are extracted from open source Python projects. rpm install a package (Debian) install a package (RPM) Examples: chmod 777 — chmod 755 — read, write, execute for all. So, for example, to. com -p 2322 If you like to connect to the server using the same options as provided in the command above simply by typing named ssh dev you’ll need to put the following lines to your "~/. When you SSH to a remote system, you’re prompted for a password. Remote Forwarding. 4- Secure syncing of data using rsync with ssh. SSH command was ssh -p 8400 -v -X -C 192. Wikipedia:SSH-- wikipedia article on Secure Shell. This example runs a few commands on a remote server and prints the result. Example: ls > directory. Offering full access to COM, WMI and. C# SSH client example to execute remote commands on Linux BOX. NET component provides two objects: A client-side SSH2 implementation for executing commands and shell sessions on Unix/Windows SSH servers, and an SFTP implementation for file transfer and remote file management over SSH. Secure Shell (SSH) is a powerful tool for connecting to remote servers. d directory on the device being bootstrapped with the knife bootstrap command. After completing installation, open command window and then run ssh; If you want a GUI ssh client you can use Putty. Once you have the IP address you need to use, make sure you also have a username and password that works on the machine you’re connecting to, and then run the command ssh [email protected] org]:29418 ([208. 4- Secure syncing of data using rsync with ssh. Now, running a simple command like firefox via SSH will open a Firefox window on the remote computer. Example :. 7 UNIX / Linux ssh-keygen Command Examples (Private and Public Key Management for SSH) by Ramesh ssh-keygen generates, manages and converts the authentication keys (private and public keys) used by SSH. With SSH, you use a terminal (or Shell) client to connect to the server. Replace username with your A2 Hosting username, and replace example. -c COMMAND or --command COMMAND - This executes a single SSH command, prints out the stdout and stderr, and exits. Example: ls -l | less | grep myword. scp uses by default the port 22, and connect via an encrypted connection or secure shell connection. % ssh -2 -N -f -L 2110:mail. 7 UNIX / Linux ssh-keygen Command Examples (Private and Public Key Management for SSH) by Ramesh ssh-keygen generates, manages and converts the authentication keys (private and public keys) used by SSH. Enter following commands to secure F0/1 port. ssh directory in your HOME directory. To connect to a remote machine using ssh, type ssh [email protected] Let's set up a. Previously, we published this kind of brief guide on some of the frequently used GNU/Linux commands like echo, unix pipeline or this can be a better example. In order to search for a file location you can use the find command. The tools provide shell functions that are authenticated and encrypted. The supported escapes (assuming the default ‘~’) are: ~. For example, to get the disk information for a remote host, you might use the command and get the output in Listing 1 below. The scp command uses the ssh command and they are very much alike. 35 SSH PuTTy Commands (With Examples) By Denisa October 6, 2018 Blogging Tips 20 Comments If you are running your own VPS chances are this list of SSH PuTTy commands could come in handy. Home » Scripts » Expect Script SSH Example Tutorial Expect script is a great linux/unix utility. ssh/config also makes it easier to use other tools that use SSH (e. Bitvise SSH Client: Graphical and command-line file transfer, terminal, and tunneling. So, for example, to. There are ways, but you are then exposing the credentials to anyone who can read the script. I believe these commands are working on any Unix-based servers. An example Gerrit SSH connection success message would look like: Example: [email protected]:/mw/core$ ssh -p 29418 [email protected] Net in a project a while ago and was very happy with it. The VMware KB also goes over commands for ESXi 4. This command is also used in -. These ssh examples, tips and commands are intended to give you a starting point; additional detail on each of the commands and capabilities is available using the man pages (man ssh, man ssh_config, man sshd_config). cURL is a very useful command line tool used to transfer data from or to a server. Connecting to other computers over a network always means a certain amount of risk. Hit Enter or Return after every command unless specified otherwise. SSH public-key authentication relies on asymmetric cryptographic algorithms that generate a pair of separate keys (a key pair), one "private" and the other "public". For ssh-add to work properly, the agent should be running, and have the SSH_AUTH_SOCK environment variable set. Our free and flexible SSH Client for Windows includes state of the art terminal emulation, graphical as well as command-line SFTP support, an FTP-to-SFTP bridge, powerful tunneling features including dynamic port forwarding through integrated proxy, and. name at a shell prompt. We are all familiar with the FTP protocol and if you are reading this article you’ve probably used it for transferring files to your virtual server and your local computer. Everyday Recipe Examples. For example, if the remote host's public key is ssh-rsa AbcCbaxxx…Example [email protected] If you replace "all" with a single protocol, that is the only protocol that can access the line. Invoking SSH commands using powershell (kinda) June 30th, 2015 alanvanwyk Leave a comment Go to comments Sometimes, you need to fire SSH commands from a Powershell session. The basic command you should use is: ssh [email protected] SAS is a general purpose, statistical package and high level data management programming language from the SAS Institute in Cary, North Carolina. But I'm about to show you a cool SSH magic trick that will impress your friends and possibly even stump Penn and Teller as to how you did it. You can vote up the examples you like or vote down the ones you don't like. Be careful not to kill your current shell - the one with the number closer to the one of the ps command you're currently running. Invoke-Command allows to execute commands on the remote machine, but your file is on the local machine. The commands which you would need to use are mv (short from move) and cp (short from copy). I've been trying to use the Esxi command line by ssh but It doesn't recognize most of the commands I type. It uses encryption to prevent illicit accesses to sensitive information that is exchanged between the client and the server. This factory function selects the correct Netmiko class based upon the device_type. See Software for a list of software categories, which usually provide graphical and text interfaces. SSH, which is an acronym for Secure SHell, was designed and created to provide the best security when accessing another computer remotely. Invoking SSH commands using powershell (kinda) June 30th, 2015 alanvanwyk Leave a comment Go to comments Sometimes, you need to fire SSH commands from a Powershell session. Once you have verified that your site profile connects and lists the remote directory correctly from within the GUI, you can then be assured that command line transfers will work with your site profile. To edit the file in vim, type the following command:. SSH is a secure communication protocol that can be used to login to remote servers and/or execute commands on remote servers. com; If this is the first time you are connecting to the server, you receive a message about the key fingerprint. For executing a simple command with ssh you have to enclose command with quotes to tell shell which characters belong to single shell command parameter. $ ssh [email protected] Learn more about ssh command and how to use it on Linux. In order to search for a file location you can use the find command. SshNet SshClient. The latest version is 0. com should always be replaced with your own domain name. Is there any way I can use ssh or something similar to enter command line prompts from my Mac terminal, similar to SSH but windows commands? (From mac to a windows 7 desktop) SSH command prompt - Windows 7 Help Forums. It uses SSH for data transfer, and uses the same authentication and provides the same security as SSH. To accomplish this we will use the same command as previously, only this time we will open up a reverse ssh tunnel to remote server or VPS. This utility is commonly used to check whether your connection to the server is healthy or not. We have appended command to be executed (highlighted in red color). --nonall > ~/. 12 for both server and client, and we're having issues with all of our sftp. First of all, access to the server is need. Using SSH public-key authentication to connect to a remote system is a robust, more secure alternative to logging in with an account password or passphrase. Since Apache Ant 1. Running Programs On Remote Hosts OR SSH Execute Remote Command There is an option to run an application on a remote host once logged in using SSH. com It is explained here Simple Java SSH Client. NET example applications demonstrate component usage in C#, VB. 6: The commands module has been removed in Python 3. Using sshpass you can use passwords to ssh or scp command without interactions, which helps to utilize in shell scripts. So, for all the beginners out there, here is my pick of the top 10 Terminal commands that every Mac user should know. That means every server that meets a given criteria can execute a corresponding command. Here is the simplest way we have found to do that and retrieve the output. net file and fill it with the desired context. Run a command script in the current shell !! Run the last command again ### Comment / Remark Commands marked • are bash built-ins Many commands particularly the Core Utils are also available under alternate shells (C shell, Korn shell etc). Your private key. While the process I just described is definitely easy, there is always some server out there that requires a ssh command that is just difficult enough to be annoying. This connection will be forwarded securely across the tunnel to mail. chef/client. Runs a command on a remote machine running SSH daemon. To generate the keys use the command ssh-keygen. The streaming jobs are run via this command. It provides a Bash emulation (Git Bash) used for running Git from the command line and the ssh-keygen command that is useful to create SSH keys as you’ll learn below. com and your username on that machine is john, type ssh [email protected] Any occurrence of %h will be substituted by the host name to connect, %p by the port, and %r by the remote user name. Some servers may restrict the traceroute command. Example 9: Set a timeout for your read command so that it will not wait indefinitely. We generate a certificate that will be used to encrypt the SSH packets using the crypto key generate rsa command. Although SSH has many uses, its main job is to provide access to a command-line over a network. $ ssh -t [email protected] "sudo systemctl restart httpd" [sudo] password for daygeek: Connection to centos7. tee - Used in the middle of a pipeline, this command allows you to both redirect output to a file, and pass it to further commands in the pipeline. For executing a simple command with ssh you have to enclose command with quotes to tell shell which characters belong to single shell command parameter. OBS By default is this disabled in ssh! The content of this file is shown when a ssh session is connected and before the authorization. Git earns another point for improving the workflow. Debian provides many command line programs through its package management system. $ ssh [email protected] Learn more about ssh command and how to use it on Linux. For example: One of the biggest drawbacks about FTP is that you cannot run specific commands to accomplish a specific task. The original package website can be still found here, including the documentation (which currently isn't available on GitHub). To use Excel VBA, a command line window needs to be run. exe to perform the SSH commands. Storcli foreign configurations commands and examples The Storage Command Line Tool (StorCLI) is the command line management software designed for the MegaRAID® product line. This is a linux command line reference for common operations. SSH not only allows you to connect to remote servers, you can use it to send an ad hoc command or commands to a remote server. For example, if the remote host's public key is ssh-rsa AbcCbaxxx…Example [email protected] Change the host aspen to your remote host. It is typically used by root to send out shutting down message to all users just before poweroff. It has full support for scp and sftp commands as well as regular ssh. If you don’t have PuTTY already installed on your machine, make sure you also download putty executable along with plink. Here are Some awk Command Examples for SSH, Possibly the Most Commonly Used Command Line Interface for Many of the Webmasters and Developers. Using the ssh client from the command line, we may specify the port using the -p switch: $ ssh -p 2345 myserver. EXEC:"ssh modem-server. It is typically used by root to send out shutting down message to all users just before poweroff. SSH is one of the handiest tools ever ported for the iPhone. Hit Enter or Return after every command unless specified otherwise. That means every server that meets a given criteria can execute a corresponding command. About Nmap. keyphrene SSH wrapper, UNIX, Windows & MacOS. This command is native to Red Hat centric Linux distros. Git is a great tool to aid your development process. Running a simple command through SSH. x and later. If issued on my laptop while I’m at home, this would open up a tunnel from port 10001 on my laptop to port 80 on my HTPC. PuTTY is a free implementation of SSH and Telnet for Windows and Unix platforms, along with an xterm terminal emulator. The command is ssh-user-config , which will create keys and a. scp command in Linux with Examples scp (secure copy) command in Linux system is used to copy file(s) between servers in a secure way. Exposed COM interface for use in COM supported environments. See Software for a list of software categories, which usually provide graphical and text interfaces. It allows one to connect to SSH servers from within Java programs. Cmdlets are lightweight commands used in the PowerShell environment. Pexpect – spawn a child application and control it as if a human were typing commands. Knowing some basic Terminal commands can really enhance your experience of OS X.