How does one copy (duplicate) and move a file from the same folder as the AppleScript code?

Something along these lines?

tell application "Finder"
    duplicate file "somefile.txt" of folder of (file (path to m开发者_JS百科e)) to folder applications of folder startup disk
end tell

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You're very close, but here is the correct script.

tell application "Finder" to duplicate "somefile.txt" of (container of (path to me)) to applications folder

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tell application "Finder"
    set prevTIDs to Applescript's text item delimiters
    set Applescript's text item delimiters to ":"
    duplicate "somefile.txt" of (text items 1 thru -2 of (path to me as string)) as alias to applications folder
    set Applescript's text item delimiters to prevTIDs
end tell