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## Environment variables
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The following environment variables are used by iat:
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| variable | description |
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| -------------- | ----------- |
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| **AT_HOME** | path to the AmbientTalk distribution directory, used to derive init file and at libraries |
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If `-p` was not specified on the command line, after evaluating the main argument file (if any), `iat` goes into a read-eval-print loop (REPL). The REPL prompts the user to input a (single-line) expression, evaluates it upon an `ENTER` key and prints the resulting value.
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Additionally, the REPL recognizes the following "commands":
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| command | description |
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| -------------- | ----------- |
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| **:q** or **:quit** | Quit the interpreter, a quicker alternative than evaluating `system.exit` |
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