The project

[exception]

I don't have the exact lines anymore, but it wasn't too fancy (it mainly consisted of grep and sed). What I had were two xml-files with two language descriptions. My lines transformed them into yacc&lex-files building a compiler from the one language to the other (if you must know: the input language was the output of an interactive medical experimentation program, the output was the input for the compiler of a laboratory robot. Sounds stupid? It was; but the robot manufacturer didn't give us the oh-so-precious hardware specifications and didn't manage to build something like a java machine on it; instead they provided a crappy compiler for a even crappier input language. Having seen how they work and whom they equip, I'm somewhat surprised that there actually is progress in medical research...).

[scythe]

Around 2000 lines.

[jsmith]

Privately about 14,000 lines of Turbo Pascal / Assembler which unfortunately I lost when multiple floppy disks died simultaneously during a file transfer due to a bad floppy disk drive :(

Professionally I work on a project that easily has 1,000,000 lines of C/C++ code, of which I own probably 75,000.

[NB: I do not work for M$].