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Static IP for Wifi sudo vi /etc/network/interfaces Add wifi string ID (Different from wifi SSID) auto lo iface lo inet loopback iface eth0 inet dhcp allow-hotplug wlan0 iface wlan0 inet manual wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf iface default inet dhcp iface home_static inet static    address 192.168.0.53    netmask 255.255.255.0    gateway 192.168.0.1  

Part 1  Recap of Datastructures  Complex Data structures Anon CDS -Hashes Part 2  Regular Expressions  Subroutines & Files Part 3  Modules  CPAN/DBI/CGI/N-w ------------------------------------------------------- Perl identify the DS by the prefix symbol  Scalar - $  - a value  List   - ()  Array  - @  Hashes - % define a lexical scalar -  my $a; default value scalar    -  undef how to check for undef  -  if(defined($a)){ } get input from keyboard -  $a=<STDIN>    # \n stops                            @arr=<STDIN>  # EOF stops output to console       -  print STDOUT "Hello";                            print "Hello"; Errors                  -  print STDERR "message"; Uppercase of scalar     -  $name=uc($name); Lowercase of scalar     -  $name=lc($name); reverse of scalar       -  $name=reverse($name); Length of scalar        -  $len=length($name); Part of a string        -  $res=substr($str,index,len); others fns              -  index($str

SCP to a seperate PORT scp -P 5050 asd.tar.gz user@192.168.1.15:/home/user Tomcat Webapps Location /usr/share/tomcat/webapps Get IP address ifconfig eth0 | awk '/inet /{print $2}' Get Tomcat logs tail -f /usr/share/apache-tomcat-7.0.30/logs/catalina.out tail -f -n 10 Running Hadoop Jobs set mapred.job.queue.name=dev hadoop jar acs.jar -D mapreduce.reduce.speculative=false -D mapreduce.map.speculative=false -D mapred.job.queue.name=dev -D mapreduce.task.io.sort.factor=256 -D file.pattern=.*20110110.* -D mapred.reduce.slowstart.completed.maps=0.9 -D mapred.reduce.tasks=10 /Input /Output hadoop jar test.jar -D mapred.job.queue.name=dev -D mapred.textoutputformat.separator=, Glassfish Webapps folder location /usr/share/glassfish4/glassfish/domains/domain1/applications Killing Mysql Processes ps -ef | grep mysql | awk -F" " '{system("kill -9  "$2)}' Starting MySQL /etc/init.d/mysqld start Mo