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They are called "legacy systems" because they have been bequeathed by someone who died.
If you have worked with REXX, COBOL, DB2, SQL, JCL, TSO, ISPF, Assembler, CLIST, Focus, Syncsort, DFSort you know that they are not dead.
The so-called legacy programming languages are heavily used by many companies. Growth in these languages is slow and sure and steady, unlike "sexy" languages which are born and expire in a few years.
COBOL programs are at the heart of the information systems of vast numbers of companies. CICS manages on-line transactions. JCL runs batch and on-line jobs.
REXX provides scripting capabilities.
DB2 continues to be the database management system that can handle extremely large relational databases.
TSO and ISPF lets you create and edit programs and data in the MVS, OS/390, Z/OS environments.
It was predicted that these languages would totally disappear before the year 2000. Didn't happen. It doesn't appear that that will happen any time soon.


My books on REXX
Sample Code: REXX, SQL
The Just Enough To Be Dangerous Series: Mainframe Minibooks on Abends, TSO, ISPF, JCL, REXX, Macros, QMF, SQL
Books on CICS
Books on COBOL
My Book on TSO/ISPF Dialogue Manager
Books on JCL
View the Just Enough Series: Mainframe Minibooks on Abends, TSO, ISPF, JCL, REXX, Macros, QMF, SQL
Books on MVS, Assembler, Java, IMS, CLIST, VSAM, AS/400, Focus, Tivoli
Books on REXX
Books on SQL, DB2, UDB, Databases
Books on Tivoli
Manuals and Tutorials: REXX, CICS, SQL, DB2, JCL, SDSF, Vsam, SAS, COBOL, AS400
Abend codes Tutorial
SQLcodes Tutorial
VSAM and QSAM file status Tutorial
TSO Line Mode Commands