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Author: Susan Vanderplas

part-tools/04-scripts-notebooks.qmd

@@ -59,18 +59,18 @@ Let's look at a terminal window for each operating system for a minute and exami
 
 The default terminal on Windows is `cmd.exe`. 
 
-![Windows terminal. The location on the computer is shown first, and the prompt character is `>`.](../images/tools/windows-terminal.png)
+![Windows terminal. The location on the computer is shown first, and the prompt character is `>`.](../images/tools/windows-terminal.png){fig-alt="Screenshot of a windows terminal."}
 
 Many people dislike `cmd.exe` and prefer to install PowerShell, which is a more fully featured terminal program. 
-![A PowerShell window generally shows your location; in this configuration, the prompt character is '>'. Note that powershell has a PS at the beginning of the line, alerting the user that they are not in `cmd.exe`. ](../images/tools/powershell-terminal.png)
+![A PowerShell window generally shows your location; in this configuration, the prompt character is '>'. Note that powershell has a PS at the beginning of the line, alerting the user that they are not in `cmd.exe`. ](../images/tools/powershell-terminal.png){fig-alt="Screenshot of a PowerShell terminal on windows"}
 
 #### {{< fa brands apple >}} Mac 
 
-![In a Mac terminal, you can see the username, computer name, location, and prompt character '%'. (base) in this image is printed because this user has a conda environment loaded -- this is something that may happen depending on how you install python. Macs use Zsh, which is a command line program (Z-shell) that interprets user input. ](../images/tools/mac-terminal.png)
+![In a Mac terminal, you can see the username, computer name, location, and prompt character '%'. (base) in this image is printed because this user has a conda environment loaded -- this is something that may happen depending on how you install python. Macs use Zsh, which is a command line program (Z-shell) that interprets user input. ](../images/tools/mac-terminal.png){fig-alt="Screenshot of a mac terminal"}
 
 #### {{< fa brands linux >}} Linux 
 
-![This is an example of a KDE-based terminal on Linux. The Username, computer name, location, and prompt character '$' are all present. This linux terminal uses BASH, which is a slightly different command line program than the Z-shell used on Macs. In Linux, it is common to choose the terminal program you most prefer, and there are many options.](../images/tools/linux-terminal.png)
+![This is an example of a KDE-based terminal on Linux. The Username, computer name, location, and prompt character '$' are all present. This linux terminal uses BASH, which is a slightly different command line program than the Z-shell used on Macs. In Linux, it is common to choose the terminal program you most prefer, and there are many options.](../images/tools/linux-terminal.png){fig-alt="screenshot of a linux terminal"}
 
 :::
 
@@ -100,7 +100,7 @@ Open your system terminal and type `R`. Hit enter.  You can issue commands direc
 
 Try typing in `2+2` and hit enter.
 
-![Launching R from the system terminal](../images/tools/terminal-launch-r.gif)
+![Launching R from the system terminal](../images/tools/terminal-launch-r.gif){fig-alt="Launching R from the system terminal screenshot. Gif shows R being typed in at the prompt, hitting enter, and seeing the R startup message."}
 
 
 #### Python - System Terminal
@@ -110,15 +110,15 @@ Open your system terminal and type `python` (on some systems, like mine, you may
 
 Try typing in `2+2` and hit enter.
 
-![Launching python from the system terminal](../images/tools/terminal-launch-py.gif)
+![Launching python from the system terminal](../images/tools/terminal-launch-py.gif){fig-alt="Gif of launching python from the system terminal. Shows typing python, getting an error message, typing python3, and getting the ipython prompt."}
 
 #### RStudio - R
 
 Open RStudio and navigate to the Console tab. You can issue commands directly to R by typing something in at the `>` prompt.
 
 Try typing in `2+2` and hit enter.
 
-![The Console tab is the left-most tab in RStudio - you can see that R's welcome message shows up first, along with version information. The last component visible is the `>`, which indicates that R is waiting for you to tell it to do something. Hitting enter will submit the command to calculate 2+2. Hopefully, you get 4.](../images/tools/Rstudio-r-console.png)
+![The Console tab is the left-most tab in RStudio - you can see that R's welcome message shows up first, along with version information. The last component visible is the `>`, which indicates that R is waiting for you to tell it to do something. Hitting enter will submit the command to calculate 2+2. Hopefully, you get 4.](../images/tools/Rstudio-r-console.png){fig-alt="Screenshot of the Rstudio window and typing 2+2 in the R console."}
 
 #### RStudio - Python