Most modern text editors and IDE interfaces provide a simple dialogue-based tool that allows us to click-on a few things, and perform such a trivial task. However, doing this from the command-line is an entirely different issue.

One of the most common approaches to this issue, is to throw some regular expressions at perl, and let ol’ Aunt Perl do her job.

find ./ -iname "*.php" -exec perl -pi -e 's/\/old\/tree\/path/\/new\/path\/tree/' {} \;

The example above would replace the hard-coded string “/old/tree/path”, with the new hard-coded string “/new/path/tree/”, in all of your PHP files.

In many cases, that simple 1-line command runs faster, and is much easier to run than using the IDE/text-editor’s GUI find/replace dialogue. It’s also much sexier. ;-p

find ~/workspace/myproject -iname "*.php" -exec php -l {} \; | grep -i "Errors.parsing"

The command above will perform a syntax check on all .php files (recursively) within the ‘~/workspace/myproject’ directory. This can be handy for code auditing, as well as debugging unfamiliar (and even familiar) code.

I’ve been trying to perfect this recipe now for a few weeks. Recently, I picked-up some Cajun Seasoning and Ghost Peppers from Nicole’s Gourmet Foods, here in South Pasadena, CA. These (2) items were just what was lacking from my previous attempts to signify my recipe.

Since it is “Super Bowl Sunday” tomorrow, and I plan on hanging out w/ some (awesome) friends and enjoying a feast, I decided to make another round of home-cooked chili.

Ingredients, Ingredients, Ingredients…

Tonight’s crockpot mission is as follows:

* 1lbs Ground Beef (Sirloin)
* 1lbs Thick-cut (uncured) Apple Wood Smoked Bacon
* 1 Red Bell pepper
* 1/2 Gold Onion
* 4oz of Lager Beer (tonight: Spaten)
* Seasoning: (1-2 tblspoon/ea) Cajun, Cumin, Chili Powder, Pepper, Salt, Beef Bouillon, and Smoked Paprika
* 1 Garlic Clove (diced)
* 1 12oz Can of Tomato Paste (8oz. should be fine, too)
* 2 cans of Organic Black Beans (drained)
* 1 diced Ghost Pepper
* 2 tblspoon of Worcestershire Sauce
* 2 tblspoon of Honey BBQ Sauce
* 1 tblspoon of Habanero Sauce

Putting it all together…

The 1st step, is to open that beer, and take a big swig. Then, you’ll need to toss that bacon on a cooking sheet, and throw it in the oven (@425 degrees). While that bacon is cooking… chop-up the onion, bell pepper, garlic, and ghost pepper. Take another swig, you deserve it.

After about 15 minutes or so, flip the bacon, and then start cooking the ground beef until it’s browned. Once it’s browned, the bacon should also (or almost) be done.

* Degrease the bacon (paper towels), and drain any fluids from the browned (cooked) ground beef.
* Toss all the beef in the crock pot. Dice-up the bacon, and toss it in.
* Toss-in the diced onion, garlic, and ghost pepper.
* Add a 1/2 bottle of beer (I used Spaten, this time).
* Add the Tomato Paste and Black beans.
* Add all the sauces and seasoning listed above.
* Add water to around the top-level of the pile, and stir it up a bit.
* Slow-cook on HIGH for 1 hour, then proceed to slow-cook on MEDIUM/LOW for approx 7-10 more hours.

UPDATE (02.12.2012):

This recipe came-out pretty darn good. My crockpot returned from the superbowl party completely empty.

I changed the ingredients (above) to suggest 12oz. of tomato paste, as the 6oz. can just didn’t quite get it thick enough. Everything else was pretty spot-on. Mmmm…. =)

NOTES:

You may want to check to see how spicy the meat is after about 4hrs. I had to add a bit more Worcestershire Sauce, as I put a bit more Habanero in that I had thought. It was pretty spicy, but I eventually got it just right. In other words, don’t be afraid to play around with the sauces until you get the taste just right! =)

Enjoy!

# line(s) 30-31
terminal=/usr/bin/aterm
terminal_allow_send_events=

“…and that’s all I’ve got to say about that.”

Initially, before switching-back to WindowMaker, I was running the XFCE Desktop Environment, which provides a ‘panel’, normal ‘taskbars’ and tools that you’d expect a modern desktop environment to provide, unlike WindowMaker, which only provides a menu system (and is all I really need).

Since WindowMaker doesn’t use a panel like xfce, nor does it provide any quick tools to interact with the NetworkManager service in Fedora (which, quite frankly, sucks for wireless connections), I’ve decided to manually configure my Wireless Connection using wpa_supplicant as a service.

Keep in mind, my netbook doesn’t actually leave my house, so this may not be the most ideal solution, if it did.

wpa_passphrase

The 1st step is to generate your PSK/TKIP Key using wpa_passphrase, as ‘root’.

su -
wpa_passphrase myessid mysecretkey >> /etc/wpa_supplicant/wpa_supplicant.conf

The command above will generate your PSK key, as well as some basic configuration settings, and append it to the wpa_supplicant configuration file (/etc/wpa_supplicant/wpa_supplicant.conf).

/etc/wpa_supplicant/wpa_supplicant.conf

Now you’ll need to edit your wpa_supplicant.conf file so that it looks similar to the following, assuming you’re using WPA2 Authentication w/ a PSK/TKIP key.

ctrl_interface=/var/run/wpa_supplicant
ctrl_interface_group=wheel
ap_scan=1

network={
 ssid="sithnet"
 proto=WPA
 key_mgmt=WPA-PSK
 group=CCMP TKIP WEP104 WEP40
 psk=???yourkey???
 priority=1
}

/etc/sysconfig/wpa_supplicant

Now that wpa_supplicant is configured to connect to our WPA2 Encrypted Wireless Router, we’ll configure wpa_supplicant to run as a service.

INTERFACES="-iwlan0"
DRIVERS="-Dwext"
OTHER_ARGS="-f /var/log/wpa_supplicant.log -P /var/run/wpa_supplicant.pid"

/etc/sysconfig/network-scripts/ifcfg-wlan0

The next step, is to configure the Wireless NIC (wlan0) to run using dhcp (automatically) when the OS boots.

DEVICE=wlan0
ONBOOT=yes
TYPE=Wireless
BOOTPROTO=dhcp

Disable/Stop the NetworkManager service

Good riddance!

chkconfig NetworkManager off
service NetworkManager stop

Enable/Start the wpa_supplicant service

Hey there, Sexy! ;-p

chkconfig wpa_supplicant on
service wpa_supplicant start

Manual Connection Command(s)

If you wish to disable auto-connection, simply mark ‘ONBOOT=no’ in /etc/sysconfig/network-scripts/ifcfg-wlan0. You can then have full control of the connection establishment yourself, manually, using the following commands:

ifconfig wlan0 up; iwconfig wlan0 essid myessid; dhclient wlan0

As long as the wpa_supplicant service is properly configured and running, then that’s all you should have to do. You should be able to still use the formal ‘service network start/stop/restart‘ commands to do most of this work for you.

Download/Install

To use the bitly.pl script, do the following:

wget http://www.seanodonnell.com/cvs.py/cvs/scripts/perl/bitly.pl
chmod +x bitly.pl

Edit the Configuration

vim bitly.pl

You’ll need to modify the $api_login and $api_key values, according to your account on bit.ly.

Once you’ve configured the $api_login and $api_key values correctly, you should be good to go.

Execute

Assuming that you’ve got your configuration properly defined, try executing the following command:

./bitly.pl http://www.seanodonnell.com/code/?id=81

…which *should* yield the following results:

url: http://www.seanodonnell.com/code/?id=81
bitly: http://bit.ly/9ijOoZ

I realize that there is a working WWW::Shorten::Bitly CPAN Module, but in this case, I really don’t want to be bogged-down by CPAN dependencies, especially when it’s just a few lines of standard LWP functions. However, if you are integrating bit.ly beyond the scope of a simple shell command, then I do suggest using the WWW::Shorten::Bitly CPAN Module, instead. It does provide a much nicer interface for such requirements.

One script that I developed and use quite often, is the irssi_logs.pl script. Someone else wrote a similar, and probably more thourough implementation of such a script, but I was bored and trying to grasp the Irssi Perl scripting environment, so I developed my own version.

Download the latest Source Code via CVS

The current revision uses a MyISAM table engine, which will soon be replaced with a more modern version which uses InnoDB instead. More logging features will soon be added as well, including private messages, and dcc chat sessions as well.

~/myproject/users.csv

The example file (users.csv) contains 3 rows and 3 columns worth of data which will be stored in our ‘users’ database table. The columns in the csv file represent the following fields: fullname, city, and state.

Example:

"Sean O\'Donnell","Los Angeles","CA"
"Bob Smith","Sacramento","CA"
"Rick Gunther","Queens","NY"

In order to import this csv file data into MySQL, we’ll use a ‘LOAD DATA’ query in mysql.

load_users.sql

The following SQL query./script would be used to load the csv file (above) into the mydb.users table.

LOAD DATA LOCAL INFILE '~/myproject/users.csv' 
INTO TABLE mydb.users 
FIELDS TERMINATED BY ',' 
ENCLOSED BY '\'' 
LINES TERMINATED BY '\r\n' 
(fullname,city,state);

This is an updated revision of an article in my old Code Snippets library. Please update your links to point to this article, instead.

Note: This is an updated revision of my old code snippets page, which will probably be replaced by this article.

For example, let’s say I’m using 2 NICs (eth0 and eth1), a cable modem (connected to eth0), and a 16-port ethernet switch (connected to eth1). I’m configuring it to act as a home-brewed Firewall/Router/Gateway for my home LAN. Let’s also assume that on this home LAN, I want to run 2 (or more) separate VLANS, from the same NIC, on the same (16-port) ethernet switch.

eth0

The 1st NIC (eth0) is connected directly to the WAN, and using DHCP Client (dhclient) to obtain the IP Address and subsequential routing information, and essential WAN connectivity.

eth1

The 2nd NIC (eth1) is running DHCP Server with ip_forwarding, essentially making the computer act as a (1)-Port Router, distributing connectivity to a 16-port ethernet switch.

I would also be configuring iptables in this scenario, but that is beside the point. To assign multiple IP addresses to eth1, we would modify the Interface Configuration (ifconfig), as seen below…

ifconfig

#!/usr/bin/env bash

# assign 192.168.1.1 to eth1;
# default (primary) IP address for eth1
ifconfig eth1 192.168.1.1 netmask 255.255.255.0 &
ifconfig eth1 up

# assign 192.168.1.100 to eth1:1;
# virtual (secondary) IP address for eth1
ifconfig eth1:1 192.168.1.100 netmask 255.255.255.0 &
ifconfig eth1:1 up

This is very handy for, say... configuring various Web Server Testing environments on a single machine, with a single NIC, with Apache configured to host multiple vhosts according to IP Address.

./ssh-keygen.sh - An SSH Key Generator and Distribution Script

Usage:  ./ssh-keygen.sh [options] command

Options:

        -l [login]      ssh server login (default: nobody@localhost)
        -p [port]       ssh port (default: 22)
        -d [dir]        remote .ssh directory (default: .ssh)

Commands:

        -g      Generate and Transfer your keys
        -t      Transfer your keys (if existing)
        -h      Help Screen (this)

Copyright (c) 2011 Sean O'Donnell <sean@seanodonnell.com>

Usage Instructions:

1. Download the script to your local file system:

   wget http://www.seanodonnell.com/cvs.py/cvs/scripts/bash/ssh-keygen.sh

2. Make the script executable:

   chmod +x ssh-keygen.sh

3. Generate and Transfer your SSH Keys to a Remote SSH Server:

   ./ssh-keygen.sh -l myname@myserver.net -g

4. Transfer your (now existing) SSH Keys to other SSH Servers:

   ./ssh-keygen.sh -l myname@myremoteserver1.net -t
   ./ssh-keygen.sh -l myname@myremoteserver2.net -t

I've recently made some changes regarding the types of Keys this script generates by default. This script currently supports the use of SSHv1 and/or SSHv2 RSA/DSA Encryption. The previous version of this script generated both by default, whereas in this current version, SSHv1 is disabled by default, but can be modified (within the script) to enable SSHv1 support. SSHv1 is generally only useful for legacy systems, which I have encountered, but the majority of modern systems most-likely have moved on to SSHv2. Whether or not you use RSA and DSA, or just DSA, in SSHv2, is not yet distinguished by this script, nor differentiated, currently. I'll probably make this more customizable later.

If you have any problems running this script, please feel free to contact me, or '/msg x0d' on Freenode.