Retrieving the Public Key for Key Pair on Linux or Mac OS

ssh-keygen command can be used on Linux or Mac OS to retrieve the public key from the private SSH key:

$ ssh-keygen -y -f MyKeyPair.pem 
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQChauLwkBK/vIiFY/t7uY6lzxESqZkZNvCAA3L42OH2fWzKptqGF+N32zjmLLSPFpYjoEHoHpi5e7yypTmiljtHcKUTwJTs3xclQrApCQvR+LneOi/5P5WaYl61G76osJesXiunLTa+RVr3LDR96LjPcql7JDnuh1RFhDqZ87nDfcGmXGV8iG7w3bk3R/2LuzzMYTgEVdv91S1OF1roH1baPXSV8MaYbOKhMUqV61+eP6/F5ZhT5Gk0BKX1KnQ3/gbgMqjMWRMZzYUeVjUbC52lYwrrBTQX5tHphAJtOTNJ/CpyuEuZ7ED+XYhX9Q1DNOZ47K51xbg5lsnyOBYSUqHz

-y – This option will read a private OpenSSH format file and print its public key.
-f – Specifies the filename of the key file.

Find Oracle patch description

Some patches contain several sub-patches inside. For example, when we download GI RU and unzip it, the unzipped folder contains several patch folders. To find out information about these patches you can do any of the following:

1. OPen README.html and find the section “Patch Numbers Getting Installed as Part of this Bundle Patch

2. Each patch sub-folder contains etc/config/inventory.xml, that contains description about patch:

[oracle@primrac1 29708769]$ pwd
 /home/oracle/Downloads/29708769

[oracle@primrac1 29708769]$ cat ./29834717/etc/config/inventory.xml|grep patch_description
     Database Release Update : 19.4.0.0.190716 (29834717)

[oracle@primrac1 29708769]$ cat ./29850993/etc/config/inventory.xml |grep patch_description
     OCW RELEASE UPDATE 19.4.0.0.0 (29850993)

Or we can see inventory.xml in all folders:

[oracle@primrac1 29708769]$ cat ./*/etc/config/inventory.xml |grep patch_description
     TOMCAT RELEASE UPDATE 19.0.0.0.0 (29401763)
     Database Release Update : 19.4.0.0.190716 (29834717)
     OCW RELEASE UPDATE 19.4.0.0.0 (29850993)
     ACFS RELEASE UPDATE 19.4.0.0.0 (29851014)

3. Another option is to use opatch lspatches or opatch query -all and query/list patch information:

[oracle@primrac1 29708769]$ pwd
 /home/oracle/Downloads/29708769

[oracle@primrac1 29708769]$ $ORACLE_HOME/OPatch/opatch lspatches ./29850993|grep patch_description
 patch_description:OCW RELEASE UPDATE 19.4.0.0.0 (29850993)

[oracle@primrac1 29708769]$ $ORACLE_HOME/OPatch/opatch lspatches ./29834717|grep patch_description
 patch_description:Database Release Update : 19.4.0.0.190716 (29834717)

[oracle@primrac1 29708769]$ $ORACLE_HOME/OPatch/opatch query -all 29850993|grep description
  Patch description: "OCW RELEASE UPDATE 19.4.0.0.0 (29850993)"

[oracle@primrac1 29708769]$ $ORACLE_HOME/OPatch/opatch query -all 29834717|grep description
  Patch description: "Database Release Update : 19.4.0.0.190716 (29834717)"