Playing with shell

everyDay.sh

#!/bin/bash
# Everyday bash script to automate the boring stuff :-) 
#
# ---++++++-------VAD3R--------++++

date;                                                             # displays date
echo "uptime:"
uptime                                                            # total up time for client
echo "Currently Connected to:"
w                                                                 # info about current connection for user
echo "+++++++++++++++++++++++"
echo "Last logins :"
last -a |head -3                                                  # info about last 3 logins on systems by users
echo "+++++++++++++++++++++++"
echo "Disk and memory usage :"
df -h                                                              # disk space ih human -readable format 
echo ""
free -m | xargs | awk '{print "Free/total memory: " $8 " / " $17 " MB"}' # free/used space free -m
echo "+++++++++++++++++++++++"
tart_log=`head -1 /var/log/messages |cut -c 1-12`
oom=`grep -ci kill /var/log/messages`
echo -n "OOM errors since $start_log :" $oom                         # info on out of memory (killed process) error
echo ""
echo "++++++++++++++++++++++"
echo "Utilization and most expensive process: "
top -b |head -3                                                      # cpu % usage and tasks
echo
top -b |head -10 |tail -4                                            # cpu % usage and tasks w.r.t. users info
echo "++++++++++++++++++++++"
echo "Open TCP ports:"
nmap -T4 127.0.0.1                                                 # Tcp port scanning
echo "++++++++++++++++++++++"
echo "Current connections :"
ss -s                                                                 # connections info
echo "processes: "
ps auxf --width=200                                                   # info about all processes
echo "++++++++++++++++++++++"
echo "vmstat :"
vmstat 1 5                                                             # more info on os processes
echo "+++++++++++++++++++++++"
echo "finally update system alias :"
xterm -hold -e sudo apt-get dist-upgrade                              # sysupdate

#----- taken from techmint.com (tweek as much as you like)

portScanner.pl

#
# Port Scanner +++++-----VAD3R------+++
#  (inspiration - null_byte)
#  usage ./portscanner.pl -h
#
use Net::Ping;
use Socket;             # socket(SOCKET, DOMAIN, TYPE, PROTOCOL)
 $| = 1;                # auto flush

 my ($ip, $protocol, $port, $iaddr, $myhouse, $log, $p_icmp, $ret_icmp, $duration, $duration_icmp, $ret_tcp, $duration_tcp, $p_tcp);
 
 ($ip, $port, $port_stop, $log) = @ARGV;
 chomp(@ARGV); 
 
 if (($ip eq '-h') or (@ARGV ne 4) ) {
	 &usage();
 }
  
  $p_tcp = Net::Ping->new("tcp");                         # to check if host is up/down
  ($ret_tcp, $duration_tcp) = $p_tcp->ping($ip);
  sleep(1);
  $p_icmp = Net::Ping->new("icmp");
 ($ret_icmp, $duration_icmp) = $p_icmp->ping($ip);
  sleep(1);
 
  if((!$ret_tcp) && (!$ret_icmp) ) {
	 $duration = $duration_tcp + $duration_icmp;
	 print "Time Duration to check if host up or down : $duration\n";
	 print "Host $ip is probably down check again...\n";
	 exit 1;
 }
 else {  
	 $protocol = getprotobyname('tcp') ;

unless (open (LOG_FILE, ">>$log")) {
				 die "can`t open file $log: $!\n"
	}
# Flushing file buffer after every write
select((select(LOG_FILE), $| = 1)[0]);

print LOG_FILE "Following ports are opened on $ip between $port and $port_stop\n\n";

print "Checking $ip for open ports....\n";

for (; $port < $port_stop; $port++) {

        socket(SOCK, PF_INET, SOCK_STREAM, $protocol) || die "socket: $!";	
	$iaddr = inet_aton($ip) || die "Cannot connect : $!"; 
	$myhouse = sockaddr_in($port, $iaddr);

	if(!connect(SOCK, $myhouse)) {
		printf "%d\r", $port;
	}
	else {
		printf "%d <- open\n", $port;
		print LOG_FILE "$port\n";
	        close SOCK || die "Close : $!\n";  
	}      

}
close LOG_FILE || die "close : $!\n";
printf "PORT SCAN COMPLETE.\n";
printf "ABOVE ALL OPEN PORTS FOR: $ip\n";
}
sub usage() {
	print "Usage : ./portscanner.pl [host] [min_port] [max_port] [log_file]\n";
	print "NO DEFAULT !! Use as mentioned above\n";
	exit 0;
}
#
# takes lot of time on firewalled n/w but is silent and accurate ;-)