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(→‎{{header|REXX}}: added the REXX computer programming language for this task.)
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<lang javascript>var interp1 = new Interp({isSafe:true, safeWriteDirs:['/tmp'], , safeReadDirs:['/tmp']});</lang>
<lang javascript>var interp1 = new Interp({isSafe:true, safeWriteDirs:['/tmp'], , safeReadDirs:['/tmp']});</lang>

=={{header|REXX}}==
For running REXX on IBM mainframes, &nbsp; REXX supports the option &nbsp; '''Scan''' &nbsp; for the &nbsp; '''trace''' &nbsp; statement.

This allows the program to be processed (and be checked for syntax errors), &nbsp; but commands to the "host system" won't be executed.

However, not all REXXes support this option.