Most of the code ( 71 % ) was written in the C programming language , and many other languages were used , including C + + , assembly language , Perl , Python , Fortran , and various shell scripting languages .
Most of the code ( 71 % ) was written in the C programming language , but many other languages were used , including C + + , assembly language , Perl , Python , Fortran , and various shell scripting languages .