I have a server running CentOS 6 successfully upgraded to CentOS 7.

The only problem I encountered so far is that ‘grep’ doesn’t work.

First thing I tried was to reinstall pcre package which provides libpcre.so*. It still didn’t work. Fortunately, someone has posted a solution as the following:

Credit: update to Centos 7; libpcre.so.0 No such file or directory