env is a shell utility for Unix-like operating systems (including Linux). It is used to run another utility in an altered environment. Here, "environment" means the shell's current set of environment variables and their values. Using env, variables may be added or removed, and the values of existing variables may be changed. The current environment is used as a basis for these changes. It is often used by scripts to launch the correct interpreter. A Unix shell, also called the command line, provides the traditional user interface for the Unix operating system. ... UNIX is a portable, multi-tasking and multi-user computer operating system originally developed by a group of AT&T Bell Labs employees including Ken Thompson, Dennis Ritchie, and Douglas McIlroy. ... In computing, an operating system (OS) is the system software responsible for the direct control and management of hardware and basic system operations. ... Tux, a lovable and cuddly penguin sitting down after having gorged itself on herring, is the official Linux mascot. ... Environment variables are a set of dynamic values that can affect the way running processes will behave. ... Scripting programming languages (commonly called scripting languages or script languages) are computer programming languages designed for scripting the operation of a computer. ... An interpreter is a computer program that executes other programs. ...
Example
Here is the code of a very simple Python script: Python is an interpreted, interactive programming language created by Guido van Rossum in 1990. ...
#!/usr/bin/env python print "Hello."
In this example, /usr/bin/env is the full path of the env command. A path is the general form of a file or directory name, giving a files name and its unique location in a file system. ...
External Links
Official GNU Env manual (http://www.gnu.org/software/coreutils/manual/html_node/coreutils_146.html)
Alternative manual for Env (from LinuxForum.com) (http://www.linuxforum.com/shell/env/31-15.php)
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