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Update-UNDERSTANDING-ENV-md #17

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12 changes: 7 additions & 5 deletions Creating-dockerFile/USING-ENV.md
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Original file line number Diff line number Diff line change
@@ -1,8 +1,10 @@
# UNDERSTANDING ENV
About environment variables when docker starts
* FROM ubuntu
* RUN apt-get-update
* ENV workdir=/root/
* WORKDIR=$workdir
**Created an environment variable for workdir.**

```dockerfile
FROM ubuntu
RUN apt-get-update
ENV workdir=/root/
WORKDIR ${workdir} # WORKDIR /root/
# Created an environment variable for workdir
```