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my $diff1 = system("sh diff.sh");
my $diff2 = system("sh diff1.sh");

a=diff aaa ccc

b=diff aaa bbb

diff aaa bbb
a=$?
# do something else with $a
exit $a

diff aaa bbb

  my $diff1 = system("diff aaa ccc >/dev/null 2>&1");
  my $diff2 = system("diff aaa bbb >/dev/null 2>&1");