moving files that have spaces in variables -bash scripting
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IFS is an environment variable used by the shell to determine where to break a list of items into single items. In other words, the IFS variable contains a list of delimeters that mark the end of an item. (man bash and search for IFS if you want to know the gory details) By default, IFS is defined to include space, tab, and newline. Normally this is what people want. So, the magic hand-waving at the top of the script saves the existing value of IFS in a temporary variable, sets IFS to include only the newline character, and that forces bash to treat files with spaces as a single item. Then, it restores the IFS to the original value in case the script has anything else to do that relies on the original value of IFS.