[root@test /] cd /usr/lib
[root@test /] ls -l libz.*
[root@test /] rm -rf libz.so libz.so.1 libz.so.1.2.11

[root@test /] ll /usr/lib64/libz.so.1.2.7

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echo '/usr/lib' >> /etc/ld.so.conf

[root@test /]# cd /lib64/
[root@test lib64]# ll libz.*
lrwxrwxrwx 1 root root    13 Dec 20 17:31 libz.so.1 -> libz.so.1.2.7
-rwxr-xr-x 1 root root 90248 Dec 20 17:11 libz.so.1.2.7

cd /usr/lib64/
ls -l libz.*

[root@localhost lib64]# ll libz.*
lrwxrwxrwx. 1 root root    13 Aug 19 16:42 libz.so.1 -> libz.so.1.2.7
-rwxr-xr-x. 1 root root 90248 Oct 31  2018 libz.so.1.2.7


[root@localhost lib64]# yum install zlib

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