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  1. or download this
         Example 3: Executing command with user bin's Environment and
     Permissions
...
     missions of user bin, type:

     example% su - bin -c "command args"
  2. or download this
    su - myuser -c "/home/myuser/t1.pl"
  3. or download this
    #!/usr/bin/perl -w
use strict;
...
print OUT "user $ENV{'USER'}\n";
close(OUT) or die;
exit;