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CLIST (Command List) (pronounced "C-List") is a procedural programming language for TSO in MVS systems. It originated in OS/360 Release 20 and has assumed a secondary role since the availability of Rexx in TSO/E Version 2. In its basic form, a CLIST program (or "CLIST" for short) can take the form of a simple list of commands to be executed in strict sequence (like a DOS batch file ( *.bat) file). However, CLIST also features If-Then-Else logic as well as loop constructs. CLIST is an interpreted language. That is, the computer must translate a CLIST every time the program is executed. CLISTs therefore tend to be slower than programs written in compiled languages such as COBOL, FORTRAN, or PL/1. (A program written in a compiled language is translated once to create a "load module" or executable.) CLIST can read/write MVS files and read/write from/to a TSO terminal. It can read parameters from the caller and also features a function to hold global variables and pass them between CLISTs. A CLIST can also call an MVS application program (written in COBOL or PL/I, for example). CLISTs can be run in background (by running JCL which executes the TSO control program (IKJEFT01)). TSO I/O screens and menus using ISPF dialog services can be displayed by CLISTs. Compare the function of CLIST with that provided by REXX. Example program: PROC 0 WRITE HELLO WORLD! Adding If-Then-Else logic: / * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ / * MULTI-LINGUAL "HELLO WORLD" PROGRAM. */ / * */ / * THIS CLIST, STORED AS USERID.TSO.CLIST(TEST), CAN BE INVOKED */ / * FROM THE ISPF COMMAND LINE AS SHOWN IN THE FOLLOWING EXAMPLE: */ / * */ / * COMMAND ===> TSO TEST SPANISH */ / * */ / * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ PROC 1 LANGUAGE IF &LANGUAGE = SPANISH THEN + WRITE HOLA, MUNDO ELSE IF &LANGUAGE = FRENCH THEN + WRITE BONJOUR, MONDE ELSE + WRITE HELLO, WORLD EXIT Note:- Here PROC is treated as a separate routine. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「CLIST」の詳細全文を読む スポンサード リンク
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