Systems Administration Problem Solvers - Page 9 of 10

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Perl Single Line – Search and Replace

Feb

2010

perl -pi -e ‘s/about news\.$/about selling advertising space\./’ file*

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American Meadows Coupon Codes

Feb

2010

$10 off your next order Use coupon code: “LOYAL” $5 off your next order Use coupon code: “SAVE”

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How many cigarette cartons can be brought into the USA?

Nov

2009

This is first hand experience! You can bring 1 carton of cigarettes into the USA duty free. Each carton after that is taxed at $10 per carton and it must be paid before leaving Customs/Immigrations to your connecting flight. The process is extremely quick and easy.

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FreeBSD: Proper buildworld technique

Nov

2009

Follow all these steps in this exact order…this is from hard-won experience!!! 1. cvsup the correct /usr/src – example cvsup files can usually be found in /root/sup. Normally we follow the security releases e.g. RELENG 6_2 rather than stable e.g. RELENG_6 2. read /usr/src/UPDATING to make sure nothing bad is going to happen. 3. rm ...

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Arizona “Action to Foreclose”

Oct

2009

Arizona Tax Lien “Action to Foreclose” notification process: 42-18202. Notice A. At least thirty days before filing an action to foreclose the right to redeem under this article, but not more than one hundred eighty days before such an action is commenced or may be commenced under section 42-18101 the purchaser shall send notice of ...

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Routing Hackers To /dev/null (Blackhole)

Oct

2009

Add: route add -host attacker_ip 127.0.0.1 -blackhole Remove: route delete -host attacker_ip 127.0.0.1 -blackhole The above will route all traffic from the “attacker_ip” to a blackhole. This is useful when you see someone relentlessly attacking any daemon on your server (ssh, http, ftp, etc). [ad#Google Adsense]

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Decrypt SMIME E-Mails – BlackBerry/iPhone

Oct

2009

I, and most everyone I deal with, use SMIME e-mail certificates from Verisign/Thawte/Home Brew. Unfortunately, these e-mails can not be viewed on an BlackBerry (without BES) or iPhone. I overcame this by creating an alias on my server that would receive e-mails, decrypt them, and send them back to me -> UNENCRYPTED. [NOTE: If you ...

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FreeBSD: Aliasing IPs

Oct

2009

[ad#Google Adsense] Edit /etc/rc.conf The primary IP of the machine will be defined by a line that looks similar to this: ifconfig_rl0=”inet 192.168.1.2 netmask 255.255.255.0″ To add additional IPs you simply: ifconfig_rl0_alias0=”inet 192.168.1.3 netmask 255.255.255.255″ ifconfig_rl0_alias1=”inet 192.168.1.4 netmask 255.255.255.255″ [ad#Google Adsense]

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FreeBSD: Moving To A Larger Harddrive

Oct

2009

[ad#Google Adsense] Moving to a Larger Hard Drive Applicable to: FreeBSD 4.3 and Higher This Sheet describes the procedure I used to move my company’s FreeBSD system to a larger hard drive. 1. Verify that the system supports two hard drives. If not, rebuild the kernel with support for two hard drives: # ATA and ...

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