ENV
env is a shell command that either reports environment variables or runs a command in a subprocess with modified environment variables. The command is provided in a Unix-like system.
By default, a subprocess inherits the environment variables of the parent process. env supports adding, modifying and removing the copied variables. env can also be used to launch the correct interpreter. In this usage, the environment is typically not changed. The command does not modify environment variables in the process in which it runs. Mechanisms for doing so include the export command and assigning a name to a value like NAME=value.
The GNU coreutils version was written by Richard Mlynarik, David MacKenzie, and Assaf Gordon. It first appeared in 4.4BSD, and is a part of POSIX.1 (with the -i option only). This version has been extended to handle signals and the current directory.
FreeBSD's version supports a custom search path. Extensions found in both versions include -u, for unsetting variables, and -S, for splitting arguments (mainly in shebang).
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