my $cmd_1 = "sudo df -h |grep /var |awk '{print \$2}' | sed -e 's/.\$//'"; my $cmd_2 = "sudo df -h |grep /var |awk '{print \$3}' | sed -e 's/.\$//'"; my $result_used = qx/ $cmd_1 /; #$result_used shows 1.4 my $result_free = qx/ $cmd_2 /; #$result_free shows 85