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    print "`set tmp` returned:", `set tmp`, " and had an exit code of:$?",
    +$/;
    print "`set non-existant-env` returned:", `set non-existant-env`, " an
    +d had an exit code of:$?",$/;
    
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    `set tmp` returned:TMP=D:\TEMP
     and had an exit code of:0
    Environment variable non-existant-env not defined
    `set non-existant-env` returned: and had an exit code of:256