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  1. or download this
    exec 3> /tmp/out
    echo 'before exec' >&3
    ...
    cat /tmp/out
       before exec
       after exec
    
  2. or download this
    export test=`perl -e 'print 'TURE'`
    
  3. or download this
    #!/usr/bin/env perl
    
    ...
    
    # simple demo:
    system('echo $test'); # prints what