Determining the installed version of gcc

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On SLES, RHEL, and CentOS

To see whether gcc is installed on SLES, RHEL, or CentOS, query for the gcc package as follows: 
   rpm -q gcc
If gcc version 4.8-5.3 is installed, you will get a result similar to the following output: 
   gcc-4.8-5.3

On Ubuntu

To see whether gcc is installed on Ubuntu, query for the gcc package as follows: 
   dpkg -l gcc
If gcc version 4.8.2-1ubuntu4 is installed, you will get a result similar to the following output: 
  Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name       Version               Architecture     Description
+++-==========-=====================-================-===================
ii  gcc        4:4.8.2-1ubuntu4      ppc64el          GNU C compiler