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pt:tldr:e885b
This command is likely used in a Unix-like operating system's command-line interface, where "pt" is the name of a command or program.
The "-wi" option is an argument passed to the "pt" command. The exact functionality of this option would depend on the specific command being used. "-wi" could be an abbreviation for a particular flag or mode, or it could have a custom interpretation within the specific program being executed.
"${foo}" is a placeholder for a variable named "foo". The curly brackets "{}" are used to enclose the variable name, allowing the system to identify it as a separate entity. The dollar sign "$" is used to indicate that the following characters form a variable name.
The value of the "foo" variable will be substituted in place of "${foo}" before the command is executed. The exact outcome would depend on the value assigned to the variable "foo" at the time the command is run.