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This command displays a simple menu of file names in the current directory. After the user made a choice, the command invokes the default editor to edit that file.
* Without the break statement, the select command will loop forever
* Setting the PS3 prompt is optional
* If the user types an invalid choice (such as the letter q), then the variable $f will become an empty string.
* For more information, look up the bash's select command
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