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my $pidChild;
my $pid0=fork();
...
  my $command='sh /path/process.sh';  
  exec($command);
  }

my $pidChild;
my $pid0=fork();
...
  my $command='sh /path/process.sh 2>&1';  
  exec($command);
  }

my $command='sh /path/process.sh > /pathlogs/mylog.log';