Commands

2. command allows you to create keyboard shortcuts, or aliases, for commonly used commands
4. deletes files. Here we remove the file waterboy.txt from the file system.
5. variable is an environment variable that displays the path of the home directory.
7. stands for “global regular expression print”. It searches files for lines that match a pattern and returns the results. stands for “global regular expression print”. It searches files for lines that match a pattern and returns the results.
9. creates a new file inside the working directory. It takes in a file name as an argument, and then creates a new empty file in the current working directory.

1. short for “unique”, takes a filename or standard input and prints out every line, removing any exact duplicates.
3. activates the changes in ~/.bash_profile for the current session. Instead of closing the terminal and needing to start a new session, source makes the changes available right away in the session we are in.
6. takes in a directory name as an argument, and then creates a new directory in the current working directory.
8. makes the variable to be available to all child sessions initiated from the session you are in.
10. copies files or directories. Here, we copy the file ada_lovelace.txt and place it in the historical/ directory