Perl Assignment #8:

Processing Text with Regular Expressions

More Control Structures

CS 447/647

Spring, 2012

Due: 3/27/12

Read chapter 9 of Learning Perl. Do exercises 1 and 3.

Read chapter 10 of Learning Perl. Do exercise 1.

Script assign8.txt

PS1=’$ ‘

cat ex9-1.pl

perl ex9-1.pl

…

# do the hands-on below

sudo tail /var/log/syslog

exit

Submit you’re assign8.txt via Web Campus.

Hands-On Exercise

(see other side)

Write to Syslog from the command line:

logger –p local5.warning ‘test’

Write to Syslog from the from Perl:

use Sys::Syslog;

openlog(“adminscript”, “cons,pid”, “user”);

syslog(“warning”,”Test Log Message”);

closelog;

# if you copy and paste – change the quotes to double quotes

# In vim try: :%s/\./”/g

Add to the end of your assign8.txt:

tail /var/log/syslog

Use ssh to connect to your system remotely:

On-campus access to port 22 is blocked by the campus firewall

Create a ssh tunnel to your system through one the CSE login servers

(banyan, sequoia, pine) which has port 22 open.

This page describes how to create a tunnel using PuTTY:

http://stefan.huberdoc.at/comp/techblog/ssh_tunnel.html

You can also create tunnels using ssh:

http://www.revsys.com/writings/quicktips/ssh-tunnel.html

Download PuTTY here:

http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html

(Optional) For those who installed at home you’ll probably need to setup port forwarding on your NAT box to access your system from outside your home network.

Check http://portforward.com for help.