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https://asktom.oracle.com/pls/asktom/f?p=100:11:0::NO::P11_QUESTION_ID:45033135081903
http://nimishgarg.blogspot.com/2014/10/how-to-connect-sqlplus-without.html
https://stackoverflow.com/questions/8444848/ksh-how-to-connect-to-sqlplus-without-using-tnsnames-ora
https://dba.stackexchange.com/questions/65032/connect-to-sql-plus-from-command-line-using-connection-string
https://dba.stackexchange.com/questions/13075/how-to-use-sqlplus-to-connect-to-an-oracle-database-located-on-another-host-with/13077
https://deviltechie.wordpress.com/2012/01/31/how-to-connect-sqlplus-without-tnsnames-ora-entry/
https://www.quora.com/What-are-the-ways-to-connect-remote-Oracle-DB-using-SQL-Plus-without-tnsnames
http://www.acehints.com/2017/03/database-connection-using-sqlplus.html
https://www.oraclerecipes.com/sql-plus/establish-connection-without-tnsnames
https://info.michael-simons.eu/2010/03/29/using-sqlplus-without-tnsnames-ora/
https://support.esri.com/en/technical-article/000010842
https://www.codeproject.com/Articles/12165/Access-Oracle-without-tnsnames-ora
https://gerardnico.com/db/oracle/connect_string