Remember that identifiers cannot have other words or symbols next to them and work properly. Let's say that you want to send an opnotice- a notice to all ops in a channel. On many networks (such as Undernet and DALnet) you can do this via /notice @#channel. Let's say you want to create /o as a shortcut to notice all ops on the current channel. Your first attempt might look like this-

/o {
  ; Send a notice to all ops [wrong]
  notice @$chan $1-
}

Unfortunately this will NOT work- because the @ is right next to $chan, $chan will not 'evaluate' properly, and the channel will not be inserted. Instead, you need spaces on either side of $chan. However, if you try-

/o {
  ; Send a notice to all ops [wrong]
  notice @ $chan $1-
}

This won't work either! You need the @ right next to the channel name for it to work, but this produces '@ #chan', not '@#chan'. You need a way to eliminate the space. The solution is to use a special identifier, $+, like so-

/o {
  ; Send a notice to all ops
  notice @ $+ $chan $1-
}

This will produce the desired result. The $+ 'squeezes' pieces together, eliminating spaces, so the $chan will become the current channel, then the @ and the channel name will become one word.

To recap, $+ eliminates spaces wherever it is placed. '@ $+ $chan' will first become '@ $+ #channel', then the spaces are killed, resulting in '@#channel'.

Learning the proper use of $+ will become more and more important later.

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