Update 04_shell_scripts.md

new_basic_shell/04_shell_scripts.md

@@ -7,8 +7,7 @@ Approximate time: 20 minutes
 
 ## Learning Objectives
 
-- Capture previous commands into a shell script
-- Implement variables in a shell script
+- Contrast shell scripts with direct commands
 
 
 ## Shell scripts
@@ -163,7 +162,8 @@ _Were the `echo` commands helpful in letting you know what came next?_
 
 ***
 
-*These materials have been developed by members of the teaching team at the [Harvard Chan Bioinformatics Core (HBC)](http://bioinformatics.sph.harvard.edu/). These are open access materials distributed under the terms of the [Creative Commons Attribution license](https://creativecommons.org/licenses/by/4.0/) (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.*
-
-*A lot of time and effort went into the preparation of these materials. Citations help us understand the needs of the community, gain recognition for our work, and attract further funding to support our teaching activities. Thank you for citing the corresponding course (as suggested in its "Read Me" section) if it helped you in your data analysis.*
+*This lesson has been developed by members of the teaching team at the [Harvard Chan Bioinformatics Core (HBC)](http://bioinformatics.sph.harvard.edu/). These are open access materials distributed under the terms of the [Creative Commons Attribution license](https://creativecommons.org/licenses/by/4.0/) (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.*
 
+* *The materials used in this lesson were derived from work that is Copyright © Data Carpentry (http://datacarpentry.org/). 
+All Data Carpentry instructional material is made available under the [Creative Commons Attribution license](https://creativecommons.org/licenses/by/4.0/) (CC BY 4.0).*
+* *Adapted from the lesson by Tracy Teal. Original contributors: Paul Wilson, Milad Fatenejad, Sasha Wood and Radhika Khetani for Software Carpentry (http://software-carpentry.org/)*