fix typo in 12.

12_virtualization.md

@@ -126,13 +126,6 @@ id
 ```
 </p>
 </details>
-
-Executing a command
-
-```sh
-singularity exec docker://alpine:latest apk
-```
-
 Launching a background container
 
 ```sh
@@ -166,7 +159,7 @@ docker rm <CONTAINER ID>
 Deleting a container image
 
 ```sh
-docker run -d -p 8787:8787 -e PASSWORD=yourpasswordhere rocker/rstudio:3.2.0docker rmi 
+docker rmi rocker/rstudio:3.2.0
 ```
 
 Try to run the `mcr.microsoft.com/windows/servercore:ltsc2019` container, what is happening ?
@@ -192,13 +185,13 @@ COPY .bashrc /
 `RUN`will execute command inside the container
 
 ```dockerfile
-RUN apt updatge && apt install -y vim
+RUN apt updatge && apt install -y htop
 ```
 
 You can then build your container:
 
 ```sh
-docker build ./ -t 'ubuntu_with_vim'
+docker build ./ -t 'ubuntu_with_htop'
 ```
 
 

index.md

@@ -15,6 +15,6 @@ title: #  Unix / command line training course
 9. [Batch processing](http://perso.ens-lyon.fr/laurent.modolo/unix/9_batch_processing.html)
 10. [Network and ssh](http://perso.ens-lyon.fr/laurent.modolo/unix/10_network_and_ssh.html)
 11. [Install system-wide programs](http://perso.ens-lyon.fr/laurent.modolo/unix/11_install_system_programs.html)
-12. [Vitalization](http://perso.ens-lyon.fr/laurent.modolo/unix/12_virtualization.html)
+12. [Virtualization](http://perso.ens-lyon.fr/laurent.modolo/unix/12_virtualization.html)