tex:tldr:53cc1
The given command is 'tex ${source-tex}'.
This command is likely used in a shell or command-line environment, where 'tex' is the name of an executable or script that processes LaTeX or TeX source files.
The '${source-tex}' portion is a placeholder or variable that should be replaced with the actual filename or path of the TeX source file you want to process.
For example, if you have a TeX source file named 'mydocument.tex' in the current directory, you would replace '${source-tex}' with 'mydocument.tex', resulting in the command 'tex mydocument.tex'.
By executing this command, the 'tex' executable or script will read and process the specified TeX source file, converting it into a typeset document such as a PDF, DVI, or other formats, depending on the configuration and options used with the 'tex' command.