Command: dpkg -l gcc* | grep ^.i

ii  gcc              4:4.1.2-3      The GNU C compiler
ii  gcc-3.3          1:3.3.6-15     The GNU C compiler
ii  gcc-3.3-base     1:3.3.6-15     The GNU Compiler Collection (base package)
ii  gcc-3.4-base     3.4.6-5        The GNU Compiler Collection (base package)
ii  gcc-4.1          4.1.2-14       The GNU C compiler
ii  gcc-4.1-base     4.1.2-14       The GNU Compiler Collection (base package)
ii  gcc-4.1-doc      4.1.1-9        Documentation for the GNU compilers (gcc, go
ii  gcc-4.1-locales  4.1.2-8        The GNU C compiler (native language support 
ii  gcc-4.1-multilib 4.1.2-14       The GNU C compiler (multilib files)
ii  gcc-4.2-base     4.2.1-1        The GNU Compiler Collection (base package)
ii  gcc-doc          4:4.1.1-5      Documentation for the GNU C compilers (gcc,