r:tldr:ce2bd

r: Execute a file.

$ R -f ${filename-R}

try on your machine

The command "R -f ${filename-R}" is written in the shell scripting language and is used to execute an R script file.

Here's a breakdown of each component of the command:

"R": It is the command to invoke the R programming language interpreter. It launches the R environment and allows you to execute R code.
"-f": It is an option or flag for the R command and is used to specify that a script file should be executed.
"${filename-R}": This is a variable substitution syntax used in shell scripting. It refers to the value of the "filename" variable, and if it is not defined, it defaults to "R". So, if a variable named "filename" is defined, it will be used as the script file to execute in R. If it is not defined, "R" will be treated as the script file.

Overall, the command executes an R script file named as the value of the "filename" variable, or "R" if the variable is not defined.

This explanation was created by an AI. In most cases those are correct. But please always be careful and never run a command you are not sure if it is safe.

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