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z/OS | Environment variables in z/OS are specified in the JCL EXEC statement PARM keyword. Environment variables are part of the IBM Language Environment (LE) and as such are specified as LE runtime options. The PARM value is divided into LE options and application options by a slash ( / ) character. Options to the left of the slash are LE options and options to the right are application options.
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UNIX | Environment variables in UNIX are defined as part of the shell environment. As such, shell commands are used to set environment variables. The environment variable must be exported to be used be a called program.
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Windows | Environment variables in Windows are defined as part of the Windows console command environment. As such, console commands are used to set environment variables.
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IBM i | Environment variables in IBM i are defined with Command Language (CL) commands for the current job environment.
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