Command blocks, in singleplayer, are capable of displaying messages up to the cap of 254 characters, using /say or /tell.
On a server, these /say commands are truncated, to a limit of ~120 characters displayed. There is no issue entering the characters on the command line, it's just that only 120 characters are displayed on a server.
For screenshot context- the 1st picture is someone testing a map creation of mine, in SMP with one other player. The other picture is in singleplayer & creative, triggering the same command block manually.
To reproduce:
1. Open up a world in singleplayer, and place a command block. Open the command line, type "/say" and as many letters or words as possible. Activate the command block with redstone. It should work as intended.
2. On a server with command blocks / permissions enabled, do the same thing. When the command block is activated, only two lines will be visible, which will only be a portion of the entered "/say" command output.
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is duplicated by 2
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It appears to only display two whole lines of text in multiplayer. I've tested this in the latest snapshot (13w03a), so I'll edit the affected version again.
1. You just type in "say blah blah" and it will work better(should)
2. I don't know I just wanted to type in "2."
Nicholas, the issue is that the characters visible in singleplayer (as many as 256 characters can fill, three or four lines) are only visible up to two whole lines in multiplayer. This is a server related issue, and it appears independent of the client OS.
Recent photo from latest snapshot. Notice that only two lines are visible. I have updated the affected version to reflect this.
I encountered Problems with characters been transfered from Win Client to a Linux Server. Probably the same effect takes place here.