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I want to know how to know whether gcc g is installed in my system
`whereis gccwhereis g++
`
执行
yum install gcc
如果装了他会告诉你已经装了如果没装他会问你是否要装
rpm -qa|egrep 'gcc|g\+\+'
敲 gcc 回车，或者敲 which gcc 回车。
yum --disablerepo=* --enablerepo=c6-media install gcc gcc-c++
直接在终端输入 gcc，即可知道gcc是否安装
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`
whereis gcc
whereis g++
`
执行
如果装了他会告诉你已经装了
如果没装他会问你是否要装
rpm -qa|egrep 'gcc|g\+\+'敲 gcc 回车，或者敲 which gcc 回车。
yum --disablerepo=* --enablerepo=c6-media install gcc gcc-c++
直接在终端输入 gcc，即可知道gcc是否安装