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+# env
+
+Read and write the environment of a process.
+
+## Usage
+
+Read the current environment
+```
+$ env
+```
+
+Run a new process under a new environment
+```
+$ env -f file command [args...]
+```
+
+
+## Notices
+
+If you run a command under the new environment, the environment is only
+**changed** not reset. So the variables which are not touched by the file
+stay the same.