Lesson 2 Practice

The instructions that follow were designed to test the skills you learned in Lesson 2. Thus, the primary focus will be navigating directories and manipulating files.

Let's navigate our files using the command line. Begin in your data directory.
Copy the Practice_L2 directory (/data/classes/BTEP/B4B_2025/Module_1/Practice_Sessions/Practice_L2) and all of its contents to your class working directory.
Solution
```
cd /data/$USER/Module_1
cp -R /data/classes/BTEP/B4B_2025/Module_1/Practice_Sessions/Practice_L2 .   
```
Change directories to Practice_L2/.
Solution
```
cd Practice_L2    
```
List the contents of Practice_L2. If there are files, when were they last modified and what is the file size?
Solution
```
ls -lh    
```
The -lh flag will allow you to obtain a list of directory content in long format, which provides information including the date the file was last modified and the file size.
Rename sample_names.txt to treatment_groups.txt.
Solution
```
mv sample_names.txt treatment_groups.txt    
```
Within Practice_L2, create a new directory called Analysis.
Solution
```
mkdir Analysis    
```
Copy treatment_groups.txt to the newly created Analysis directory.
Solution
```
cp treatment_groups.txt ./Analysis    
```
List the contents of the Analysis directory.
Solution
```
ls -l ./Analysis    
```
Change directories to Analysis. What is the path to Analysis?
Solution
```
cd Analysis  
pwd    
```
Change to the data directory within the lesson practice directory (Practice_L2).
Solution
```
cd ../data    
```
List the contents of data.
Solution
```
ls    
```
View A_R1.fastq.
Solution
```
less A_R1.fastq    
q
```
Copy and paste the first line of A_R1.fastq into a new file called Line1.txt using keyboard shortcuts and nano.
Move Line1.txt to Practice_L2 using a relative file path.
Solution
```
mv Line1.txt ..    
```
Change to the Practice_L2 directory and list the content of the directory.
Solution
```
cd ..    
ls
```
Remove the Analysis directory.
Solution
```
rm -ir Analysis  
```