COPYLIB is a private library specifies that where the copy books are available.
COPYLIB libraries are of type PDS.
Each member in the PDS is a user written COBOL source code which is a part of actual program.
COPYLIB can be used to search the copy books used in the library during the compilation of the program.
A COPY statement can copies the source code from library to program.
COPYLIB can be coded during the compilation time and along with compilation step.
//COPYLIB DD DSN=copybook-library
If the COPY control statement used enter the COPYLIB DD statement.
The COPYLIB DD statement contains control statement members selected by COPY control statement.
JCL PROCLIB JCL - SYSABEND