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PowerShell is a task automation and configuration management program from Microsoft, consisting of a command-line shell and the associated scripting language.Initially a Windows component only, known as Windows PowerShell, it was made open-source and cross-platform on August 18, 2016, with the introduction of PowerShell Core. [5]
Command-line completion allows the user to type the first few characters of a command, program, or filename, and press a completion key (normally Tab ↹) to fill in the rest of the item. The user then presses Return or ↵ Enter to run the command or open the file.
Background execution allows a shell to run a command without user interaction in the terminal, freeing the command line for additional work with the shell. POSIX shells and other Unix shells allow background execution by using the & character at the end of command. In PowerShell, the Start-Process [43] or Start-Job [44] cmdlets can be used.
Windows PowerShell, Microsoft's object-oriented command line shell and scripting language, executes the cd command (cmdlet) within the shell's process. However, since PowerShell is based on the .NET Framework and has a different architecture than previous shells, all of PowerShell's cmdlets like ls, rm etc. run in the shell's process. Of course ...
Terminal is a command-line front-end. It can run multiple command-line apps, including text-based shells in a multi-tabbed window. It has out-of-the-box support for Command Prompt, PowerShell, and Bash on Windows Subsystem for Linux (WSL). [6] It can natively connect to Azure Cloud Shell. [7]
Useful command lines can be saved by assigning a character string or alias to represent the full command, or several commands can be grouped to perform a more complex sequence – for instance, compile the program, install it, and run it — creating a single entity, called a command procedure or script which itself can be treated as a command ...
Calvin Mooers in his TRAC language is generally credited with inventing command substitution, the ability to embed commands in scripts that, when interpreted, insert a character string into the script. [7] Multics calls these active functions. [8] Louis Pouzin wrote an early processor for command scripts called RUNCOM for CTSS around 1964.
In computing, command substitution is a facility that allows a command to be run and its output to be pasted back on the command line as arguments to another command. Command substitution first appeared in the Bourne shell , [ 1 ] introduced with Version 7 Unix in 1979, and has remained a characteristic of all later Unix shells .