Cocoaの機能を使ってdefaultsコマンドを実行するAppleScriptハンドラ ref: http://qiita.com/szk-3/items/7b23c77196ba8d26ed77

defaultsRead_Write_Delete.scpt

use framework "Foundation"

my defaultsRead("com.apple.dock")
my defaultsWrite("com.apple.dock", {pinning:"start"})
my defaultsDelete("com.apple.dock", {"pinning"})

on defaultsRead(domain as text)
    --require framework: Foundation
    set defaults to current application's NSUserDefaults's standardUserDefaults()
    return (defaults's persistentDomainForName:domain) as record
end defaultsRead

on defaultsWrite(domain as text, writeDictionary as record)
    --require framework: Foundation
    set defaults to current application's NSUserDefaults's standardUserDefaults()
    set preferencesDictionary to (defaults's persistentDomainForName:domain)'s mutableCopy()
    preferencesDictionary's addEntriesFromDictionary:writeDictionary
    defaults's setPersistentDomain:preferencesDictionary forName:domain
    my defaultsSynchronize()
end defaultsWrite

on defaultsDelete(domain as text, deleteKeys as list)
    --require framework: Foundation
    set defaults to current application's NSUserDefaults's standardUserDefaults()
    set preferencesDictionary to (defaults's persistentDomainForName:domain)'s mutableCopy()
    preferencesDictionary's removeObjectsForKeys:deleteKeys
    defaults's setPersistentDomain:preferencesDictionary forName:domain
    my defaultsSynchronize()
end defaultsDelete

on defaultsSynchronize()
    --require framework: Foundation
    set success to current application's NSUserDefaults's standardUserDefaults()'s synchronize()
    if not success then
        error "Synchronization in NSUserDefaults has failed"
    end if
end defaultsSynchronize

file0.txt

defaults read com.apple.dock
defaults write com.apple.dock pinning -string start
defaults delete com.apple.dock pinning