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Added usage example for -e for exec 

Signed-off-by: Vishnu Narayanan <iamwishnu@gmail.com>
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
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Sebastiaan van Stijn 2017-06-15 17:24:41 +02:00
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docs/reference/commandline/exec.md
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@ -76,6 +76,17 @@ $ docker exec -it ubuntu_bash bash
This will create a new Bash session in the container `ubuntu_bash`.
Next, set an environment variable in the current bash session.
```bash
$ docker exec -it -e VAR=1 ubuntu_bash bash
```
This will create a new Bash session in the container `ubuntu_bash` with environment
variable `$VAR` set to "1". Note that this environment variable will only be valid
on the current Bash session.
### Try to run `docker exec` on a paused container
If the container is paused, then the `docker exec` command will fail with an error: