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if you need to execute a command and have all the data from the command passed directly back without any interference, use the passthru() function.
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exec() executes the given command, however it does not output anything. it simply returns the last line from the result of the command. if you need to execute a command and have all the data from the command passed directly back without any interference, use the passthru() function.
if the array argument is present, then the specified array will be filled with every line of output from the command.