cowsay:tldr:48814
The command "cowsay" is a whimsical command line utility in Unix-like operating systems that generates an ASCII art representation of a cow speaking a message. It allows the user to specify different types of cows and speech bubbles.
In the given command, "cowsay -f ${art} "${hello, world}"", the following is happening:
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"cowsay": The main command to run the cowsay utility.
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"-f": Specifies the option to select a specific cow file for the ASCII art. In this case, the variable "${art}" is used to represent the cow file. The value of this variable should be provided by the user or set in the shell environment before running the command.
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"${hello, world}": The message that the cow will speak. The text "hello, world" will be displayed within the speech bubble of the cow.
To execute this command, you would replace "${art}" with the name of a specific cow file available in the installation of cowsay. For example, if you have a cow file named "dragon.cow", you would run the command as "cowsay -f dragon.cow "hello, world"". The output would then be an ASCII art representation of a dragon speaking the message "hello, world".