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use strict;
use warnings;
...

system_memory=`cat /proc/meminfo |grep -w MemTotal |awk '{print $2}'`
total_system_memory=$(echo "$system_memory * 1024" | bc -l)

#!/usr/bin/perl -w
use strict;
...
  my $command = "`cat /proc/meminfo |grep -w MemTotal |awk '{print $2}
+'`";--->line 9

ssh('user@hostname', $command);

Use of uninitialized value in concatenation (.) or string at ./ssh.pl 
+line 9.
ssh: hostname: Name or service not known

#!/usr/bin/perl -w
use strict;
...
ssh("$user\@$hostname", "$command");

Host key verification failed.