/usr/bin/gsharp is in mono-tools-gui 2.11+git20131009.5b1ef35-1build1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 | #!/bin/sh
exec /usr/bin/mono $MONO_OPTIONS "/usr/lib/gsharp/gsharp.exe" "$@"
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