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user@host $ scl enable devtoolset-4 bash
bash-4.1$ gcc --version
gcc (GCC) 5.2.1 20150902 (Red Hat 5.2.1-2)
bash-4.1$ exit

ksa@iris02 $ scl enable devtoolset-4 'gcc --version'
gcc (GCC) 5.2.1 20150902 (Red Hat 5.2.1-2)
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

How to install Developer Toolset / Software Collections on CentOS 7:

$ sudo yum install centos-release-scl

$ sudo yum install devtoolset-6
$ scl enable devtoolset-6  'gcc --version | head -1'

gcc (GCC) 6.2.1 20160916 (Red Hat 6.2.1-3)

The Red Hat Developer Toolset (DTS) is intended to give developers access to updated compilers and tools for C and C++ development.

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