I tried before getting this below meassage.
[root@brurhenaaa001 ~]# sudo apt-get install postgresql-pltcl-11
sudo: apt-get: command not found
[root@brurhenppp001 ~]# yum install postgresql-pltcl-11
Loaded plugins: enabled_repos_upload, langpacks, package_upload, product-id, search-disabled-repos, subscription-manager
rhel-7-server-eus-optional-rpms | 2.0 kB 00:00:00
rhel-7-server-eus-satellite-tools-6.2-rpms | 2.1 kB 00:00:00
rhel-7-server-extras-rpms | 2.0 kB 00:00:00
rhel-7-server-rpms | 2.0 kB 00:00:00
rhel-7-server-satellite-tools-6.2-rpms | 2.1 kB 00:00:00
rhel-server-rhscl-7-eus-rpms | 2.0 kB 00:00:00
tnc_Extra_Packages_for_Enterprise_Linux_7_Extra_Packages_for_Enterprise_Linux_7 | 2.1 kB 00:00:00
No package postgresql-pltcl-11 available.
Error: Nothing to do
Uploading Enabled Repositories Report
Loaded plugins: langpacks, product-id, subscription-manager