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    It might not be difficult to patch a terminal program to colourize the stderr stream. Somebody has suggested something like this at ubuntu brainstorm. Commented May 2, 2011 at 3:27
  • @intuited: that would require pathcing every terminal emulator you want this to work with. Using LD_PRELOAD trick to intercept write calls seems to be the most appropriate, IMO (but then again, there might be differences on certain *nix flavors.) Commented May 2, 2011 at 13:24
  • At least on Linux, intercepting write alone would not work as most applications do not call directly, but another function from some shared library (like printf) that would call the original write Commented Nov 1, 2012 at 23:02
  • @StephaneChazelas I was thinking of hooking around the write syscall wrapper. Is it inlined in other functions in Glibc? Commented Nov 1, 2012 at 23:13
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    The stderred project seems to be an implementation of hooking write via LD_PRELOAD as you describe. Commented Nov 10, 2013 at 14:41