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---
title: "**echo**(1) acceptance tests"
author:
- The Fable project
- Lars Wirzenius
- Daniel Silverstone
...
Introduction
=============================================================================
**echo**(1) is a Unix command line tool, which writes its command line
arguments to the standard output. This is a simple acceptance test
suite for the `/bin/echo` implementation.
No arguments
=============================================================================
Run `/bin/echo` without arguments.
```fable
when user runs echo without arguments
then exit code is 0
and standard output contains a newline
and standard error is empty
```
Hello, world
=============================================================================
This scenario runs `/bin/echo` to produce the output "hello, world".
```fable
when user runs echo with arguments hello, world
then exit code is 0
and standard output contains "hello, world"
and standard error is empty
```
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