xpdf:tldr:d7af9

The command "xpdf ${filename-pdf}" is using the xpdf tool to open and display the contents of a PDF file. Here's a breakdown of the command: - "xpdf": This is the name of the tool or application used to open and view PDF files. - "${filename-pdf}": This is a variable that represents the name of the PDF file you want to open. The way the variable is written, "${filename-pdf}", suggests that the actual filename should be provided, replacing "${filename-pdf}". For example, if you have a PDF file named "example.pdf" that you want to open using xpdf, the command would look like this: xpdf example.pdf By replacing "${filename-pdf}" with the actual filename, the command allows you to specify and open any PDF file you want to view using xpdf.