The GNU debugger (gdb) is a standard tool for debugging C and (to a lesser extent) Pascal code. It is largely line-based and uses a standard set of commands, such as "print", "stop at" or "stop in". The main reason for its installation on the SunFire cluster is its use in combination with the Gnu Pascal compiler gpc. This debugger is public domain and very portable. Note that for Fortran and C/C++ programs, the use of Oracle Solaris Studio is recommended.