Too many zeros

Get IP address of a site from a specific NameServer

It sometimes happen that you have created a domain in your hosting account and did not point the NS record of the domain to the hosting providers NameServer. So if you want to connect to the server through SSH you don’t have the IP address. To find out the IP address you will have to ping the NameServer of the Hosting provider only. So here is a tool that allows you to do that.

http://www.kloth.net/services/dig.php

Updating the link description cached in facebook.

Whenever a link is shared in facebook the description of the page is cached by facebook and the same description is used every time the link is shared again. The problem is, if you change the description of the page in your site and want that change to come in the description of the link you want to share it won’t happen because a cache of the old description is stored with facebook.

Solution is use this tool to see the stats of the link and also update the old cached data.

http://developers.facebook.com/tools/lint/

Claiming your Google Apps Account

Today I bought a domain and when I was configuring Google Apps with it, I found that the Account was already take.

My question was How can it happen? . The only answer I can think of is that the domain was owned by someone else before I bought it and he must have signed-up for the Google apps service.

So how do I get access to the apps account?

1. Reset the admin password using this link. http://www.google.com/support/a/bin/answer.py?hl=en&answer=143296#password This will take 48 Hrs to complete.
2. After getting the admin password. Reset other email IDs and passwords.

Hope this post is helpful.

Evergreen Godaddy Discount Coupons

OYH10 – $2.50 off / $7.49 any .COM (renewals too)-(28.25% off from $10.69)

BTPS101 – 20% any order of $50 or more

BTPS111 – 10% off anything

BTPS255 – 25% off $100 or more

OYH8 – 10% off whatever

OYH9 – $5 off a $30 purchase

OYH20H1 – 20% off hosting

chill8 – 10% off

chill9 – $5 off $30

chill10 – $7.49 .coms

hash8 – 10% off

hash9 – $5 off $30

hash10 – $7.49 .com registration

gdd1101c – 10% off any order of $40 or more

IAPtdom1 – $7.49 Domains

IAPth1 – 20% off Hosting

promo10 – 10% off your entire order

promo15 – Save 15% on your order of $75 or more

promo20 - 20% off shared hosting (minimum 12 months)

promo530 -Save $5 off any order of $30 or more

promo749 - Save $3 on .com registrations, transfers and renewals

promossl -$12.99 standard SSL certificates (normally $29.95)

For better understanding I have categorized it with offers

Domain Purchase

$7.49 .com registration
OYH10 – $2.50 off / $7.49 any .COM (renewals too)-(28.25% off from $10.69)
hash10 -  $7.49 .com registration
IAPtdom1 – $7.49 .com registration
chill10 – $7.49 .com registration

BTPS255 – 25% any order of $100 or more

BTPS101 – 20% any order of $50 or more

Save $5 off any order of $30 or more (Maximum  %16)
OYH9 – Save $5 off any order of $30 or more
chill9 – Save $5 off any order of $30 or more
hash9 – Save $5 off any order of $30 or more
promo530 -Save $5 off any order of $30 or more

10% off your entire order
BTPS111 – 10% off your entire order
OYH8 – 10% off your entire order
chill8 – 10% off your entire order
hash8 – 10% off your entire order
promo10 – 10% off your entire order

Hosting

20% off shared hosting
OYH20H1 – 20% off hosting
IAPth1 – 20% off Hosting
promo20 – 20% off shared hosting (minimum 12 months)

Other

promo749 – Save $3 on .com registrations, transfers and renewals

promossl -$12.99 standard SSL certificates (normally $29.95)

Social Media Revolution

Social Media Revolution: Is social media a fad?
Or is it the biggest shift since the Industrial Revolution? This video details out social media facts and figures that are hard to ignore. This video is produced by the author of Socialnomics – Erik Qualman in 2009.

Just watch the video, you will be thrilled.

Ended my search for a good hosting service.

I have been searching for a good hosting service for the  last few weeks and now it has ended. I found DeamHost , it stands what its name is: its truly dream host.

My requirements were.

But with Dream Host I get all the above features plus:

1. SEO Hosting (You get Different IPs whenever you create a new domain so almost all your domains have different IPs sometimes even different C class IPs ).
2. Amazing Control Panel (They have put in all the features you ever dreamt of, you get a feeling that you don’t need any support you can do every thing your self.)
Quick Chat Support. (Just click and chat you have all the solutions to your problem.)
3. I asked for SVN Client, they have the SVN server also, now I don’t need another service that I was using to create and I can track the project in SVN.
Great knowledge base (wiki) explaining concept and solution for troubleshooting.

The normal hosting charge is $8.95/mo! . And there are different plans also.

But if you follow this link the charges will go down to $1.87$8.95/mo! (This is if you take a 1 year plan).

Debugging SMTP

Telnet – SMTP Commands (sending mail using telnet)

In order to access your mailbox you will need 3 things: An active internet connection (an embarrasing stage to miss sometimes!)

The address of a mail server capable of relaying for you – usually provided by your dialup provider (e.g. mail.domain.ext)

A valid email address (e.g. mail@domain.ext)

The first thing to do is to open a connection from your computer to your mail server. telnet mail.domain.ext 25

You should receive a reply like: Trying ???.???.???.???… Connected to mail.domain.ext. Escape character is ‘^]’. 220 mail.domain.ext ESMTP Sendmail ?version-number?; ?date+time+gmtoffset?

You will then need to delcare where you are sending the email from: HELO local.domain.name

- dont worry too much about your local domain name although you really should use your exact fully qualified domain name as seen by the outside world the mail server has no choice but to take your word for it as of RFC822-RFC1123. This should give you: 250 mail.domain.ext Hello local.domain.name [loc.al.i.p], pleased to meet you

Now give your email address: MAIL FROM: mail@domain.ext

Should yeild: 250 2.1.0 mail@domain.ext… Sender ok

If it doesn’t please see possible problems. Now give the recipients address: RCPT TO: mail@otherdomain.ext

Should yeild: 250 2.1.0 mail@otherdomain.ext… Recipient ok

If it doesn’t please see possible problems. To start composing the message issue the command DATA

If you want a subject for your email type Subject:-type subject here-

then press enter twice (these are needed to conform to RFC 882) You may now proceed to type the body of your message (e.g. hello mail@otherdomain.ext from mail@domain.ext

) To tell the mail server that you have completed the message enter a single “.

” on a line on it’s own. The mail server should reply with: 250 2.0.0 ???????? Message accepted for delivery

You can close the connection by issuing the QUIT

command. The mailserver should reply with something like:221 2.0.0 mail.domain.ext closing connection Connection closed by foreign host.

Here are a list of problems I’ve encountered and their fixes

503 Need MAIL before RCPT

A recipient has been specified before a sender. 550 mail@domain.ext… Relaying Denied

The mail server has refused to relay mail for you, this may be for any number of reasons but typical resons include: Not using this provider for an internet connection and/or Not using an email address provided by the owner of the server. Some things to watch out for: 1. If you type too quickly, sometimes it won’t recognise your text (weird!) 2. The backspace key sometimes does not work with some telnet clients (even though it may seem as though it does) I’ll be putting more as and when I get them and figure out how to fix each problem.

Mysql database replication

Slave:
1. mysql -u root -p
start slave;
show slave status\G;
Stop Slave io_thread;

Master:
mysql -u root -p
show master status;

mysql>change master to  master_log_file=’mysql-bin.000002′, master_log_pos=684608641;
mysql>start slave;
reset slave;

FLUSH TABLES WITH READ LOCK;
UNLOCK TABLES
Now it will get updates,

rsync -azpSv -e ‘ssh -p 99′ root@10.3.1.51:/gt/fsrvthis/mysqldata .

Linux Cheat Sheet

Command		Description
•	apropos whatis	Show commands pertinent to string. See also threadsafe
•	man -t man | ps2pdf – > man.pdf	make a pdf of a manual page
	which command	Show full path name of command
	time command	See how long a command takes
•	time cat	Start stopwatch. Ctrl-d to stop. See also sw
•	nice info	Run a low priority command (The “info” reader in this case)
•	renice 19 -p $$	Make shell (script) low priority. Use for non interactive tasks
dir navigation
•	cd -	Go to previous directory
•	cd	Go to $HOME directory
	(cd dir && command)	Go to dir, execute command and return to current dir
•	pushd .	Put current dir on stack so you can popd back to it
file searching
•	alias l=’ls -l –color=auto’	quick dir listing
•	ls -lrt	List files by date. See also newest and find_mm_yyyy
•	ls /usr/bin | pr -T9 -W$COLUMNS	Print in 9 columns to width of terminal
	find -name ‘*.[ch]‘ | xargs grep -E ‘expr’	Search ‘expr’ in this dir and below. See also findrepo
	find -type f -print0 | xargs -r0 grep -F ‘example’	Search all regular files for ‘example’ in this dir and below
	find -maxdepth 1 -type f | xargs grep -F ‘example’	Search all regular files for ‘example’ in this dir
	find -maxdepth 1 -type d | while read dir; do echo $dir; echo cmd2; done	Process each item with multiple commands (in while loop)
•	find -type f ! -perm -444	Find files not readable by all (useful for web site)
•	find -type d ! -perm -111	Find dirs not accessible by all (useful for web site)
•	locate -r ‘file[^/]*\.txt’	Search cached index for names. This re is like glob *file*.txt
•	look reference	Quickly search (sorted) dictionary for prefix
•	grep –color reference /usr/share/dict/words	Highlight occurances of regular expression in dictionary
archives and compression
	gpg -c file	Encrypt file
	gpg file.gpg	Decrypt file
	tar -c dir/ | bzip2 > dir.tar.bz2	Make compressed archive of dir/
	bzip2 -dc dir.tar.bz2 | tar -x	Extract archive (use gzip instead of bzip2 for tar.gz files)
	tar -c dir/ | gzip | gpg -c | ssh user@remote ‘dd of=dir.tar.gz.gpg’	Make encrypted archive of dir/ on remote machine
	find dir/ -name ‘*.txt’ | tar -c –files-from=- | bzip2 > dir_txt.tar.bz2	Make archive of subset of dir/ and below
	find dir/ -name ‘*.txt’ | xargs cp -a –target-directory=dir_txt/ –parents	Make copy of subset of dir/ and below
	( tar -c /dir/to/copy ) | ( cd /where/to/ && tar -x -p )	Copy (with permissions) copy/ dir to /where/to/ dir
	( cd /dir/to/copy && tar -c . ) | ( cd /where/to/ && tar -x -p )	Copy (with permissions) contents of copy/ dir to /where/to/
	( tar -c /dir/to/copy ) | ssh -C user@remote ‘cd /where/to/ && tar -x -p’	Copy (with permissions) copy/ dir to remote:/where/to/ dir
	dd bs=1M if=/dev/sda | gzip | ssh user@remote ‘dd of=sda.gz’	Backup harddisk to remote machine
rsync (Network efficient file copier: Use the –dry-run option for testing)
	rsync -P rsync://rsync.server.com/path/to/file file	Only get diffs. Do multiple times for troublesome downloads
	rsync –bwlimit=1000 fromfile tofile	Locally copy with rate limit. It’s like nice for I/O
	rsync -az -e ssh –delete ~/public_html/ remote.com:’~/public_html’	Mirror web site (using compression and encryption)
	rsync -auz -e ssh remote:/dir/ . && rsync -auz -e ssh . remote:/dir/	Synchronize current directory with remote one
ssh (Secure SHell)
	ssh $USER@$HOST command	Run command on $HOST as $USER (default command=shell)
•	ssh -f -Y $USER@$HOSTNAME xeyes	Run GUI command on $HOSTNAME as $USER
	scp -p -r $USER@$HOST: file dir/	Copy with permissions to $USER’s home directory on $HOST
	ssh -g -L 8080:localhost:80 root@$HOST	Forward connections to $HOSTNAME:8080 out to $HOST:80
	ssh -R 1434:imap:143 root@$HOST	Forward connections from $HOST:1434 in to imap:143
wget (multi purpose download tool)
•	(cd dir/ && wget -nd -pHEKk http://www.pixelbeat.org/cmdline.html)	Store local browsable version of a page to the current dir
	wget -c http://www.example.com/large.file	Continue downloading a partially downloaded file
	wget -r -nd -np -l1 -A ‘*.jpg’ http://www.example.com/dir/	Download a set of files to the current directory
	wget ftp://remote/file[1-9].iso/	FTP supports globbing directly
•	wget -q -O- http://www.pixelbeat.org/timeline.html | grep ‘a href’ | head	Process output directly
	echo ‘wget url’ | at 01:00	Download url at 1AM to current dir
	wget –limit-rate=20k url	Do a low priority download (limit to 20KB/s in this case)
	wget -nv –spider –force-html -i bookmarks.html	Check links in a file
	wget –mirror http://www.example.com/	Efficiently update a local copy of a site (handy from cron)
networking (Note ifconfig, route, mii-tool, nslookup commands are obsolete)
	ethtool eth0	Show status of ethernet interface eth0
	ethtool –change eth0 autoneg off speed 100 duplex full	Manually set ethernet interface speed
	iwconfig eth1	Show status of wireless interface eth1
	iwconfig eth1 rate 1Mb/s fixed	Manually set wireless interface speed
•	iwlist scan	List wireless networks in range
•	ip link show	List network interfaces
	ip link set dev eth0 name wan	Rename interface eth0 to wan
	ip link set dev eth0 up	Bring interface eth0 up (or down)
•	ip addr show	List addresses for interfaces
	ip addr add 1.2.3.4/24 brd + dev eth0	Add (or del) ip and mask (255.255.255.0)
•	ip route show	List routing table
	ip route add default via 1.2.3.254	Set default gateway to 1.2.3.254
•	tc qdisc add dev lo root handle 1:0 netem delay 20msec	Add 20ms latency to loopback device (for testing)
•	tc qdisc del dev lo root	Remove latency added above
•	host pixelbeat.org	Lookup DNS ip address for name or vice versa
•	hostname -i	Lookup local ip address (equivalent to host `hostname`)
•	whois pixelbeat.org	Lookup whois info for hostname or ip address
•	netstat -tupl	List internet services on a system
•	netstat -tup	List active connections to/from system
windows networking (Note samba is the package that provides all this windows specific networking support)
•	smbtree	Find windows machines. See also findsmb
	nmblookup -A 1.2.3.4	Find the windows (netbios) name associated with ip address
	smbclient -L windows_box	List shares on windows machine or samba server
	mount -t smbfs -o fmask=666,guest //windows_box/share /mnt/share	Mount a windows share
	echo ‘message’ | smbclient -M windows_box	Send popup to windows machine (off by default in XP sp2)
text manipulation (Note sed uses stdin and stdout. Newer versions support inplace editing with the -i option)
	sed ‘s/string1/string2/g’	Replace string1 with string2
	sed ‘s/\(.*\)1/\12/g’	Modify anystring1 to anystring2
	sed ‘/ *#/d; /^ *$/d’	Remove comments and blank lines
	sed ‘:a; /\\$/N; s/\\\n//; ta’	Concatenate lines with trailing \
	sed ‘s/[ \t]*$//’	Remove trailing spaces from lines
	sed ‘s/\([\\`\\"$\\\\]\)/\\\1/g’	Escape shell metacharacters active within double quotes
•	seq 10 | sed “s/^/ /; s/ *\(.\{7,\}\)/\1/”	Right align numbers
	sed -n ’1000p;1000q‘	Print 1000th line
	sed -n ’10,20p;20q‘	Print lines 10 to 20
	sed -n ‘s/.*<title>\(.*\)<\/title>.*/\1/ip;T;q‘	Extract title from HTML web page
	sed -i 42d ~/.ssh/known_hosts	Delete a particular line
	sort -t. -k1,1n -k2,2n -k3,3n -k4,4n	Sort IPV4 ip addresses
•	echo ‘Test’ | tr ‘[:lower:]‘ ‘[:upper:]‘	Case conversion
•	tr -dc ‘[:print:]‘ < /dev/urandom	Filter non printable characters
•	history | wc -l	Count lines
set operations (Note you can export LANG=C for speed. Also these assume no duplicate lines within a file)
	sort file1 file2 | uniq	Union of unsorted files
	sort file1 file2 | uniq -d	Intersection of unsorted files
	sort file1 file1 file2 | uniq -u	Difference of unsorted files
	sort file1 file2 | uniq -u	Symmetric Difference of unsorted files
	join -a1 -a2 file1 file2	Union of sorted files
	join file1 file2	Intersection of sorted files
	join -v2 file1 file2	Difference of sorted files
	join -v1 -v2 file1 file2	Symmetric Difference of sorted files
math
•	echo ‘(1 + sqrt(5))/2′ | bc -l	Quick math (Calculate ?). See also bc
•	echo ‘pad=20; min=64; (100*10^6)/((pad+min)*8)’ | bc	More complex (int) e.g. This shows max FastE packet rate
•	echo ‘pad=20; min=64; print (100E6)/((pad+min)*8)’ | python	Python handles scientific notation
•	echo ‘pad=20; plot [64:1518] (100*10**6)/((pad+x)*8)’ | gnuplot -persist	Plot FastE packet rate vs packet size
•	echo ‘obase=16; ibase=10; 64206′ | bc	Base conversion (decimal to hexadecimal)
•	echo $((0x2dec))	Base conversion (hex to dec) ((shell arithmetic expansion))
•	units -t ’100m/9.69s‘ ‘miles/hour’	Unit conversion (metric to imperial)
•	units -t ’500GB’ ‘GiB’	Unit conversion (SI to IEC prefixes)
•	units -t ’1 googol’	Definition lookup
•	seq 100 | (tr ‘\n’ +; echo 0) | bc	Add a column of numbers. See also add and funcpy
calendar
•	cal -3	Display a calendar
•	cal 9 1752	Display a calendar for a particular month year
•	date -d fri	What date is it this friday. See also day
•	[ $(date -d "tomorrow" +%d) = "01" ] || exit	exit a script unless it’s the last day of the month
•	date –date=’25 Dec’ +%A	What day does xmas fall on, this year
•	date –date=’@2147483647′	Convert seconds since the epoch (1970-01-01 UTC) to date
•	TZ=’:America/Los_Angeles’ date	What time is it on West coast of US (use tzselect to find TZ)
	echo “mail -s ‘get the train’ P@draigBrady.com < /dev/null” | at 17:45	Email reminder
•	echo “DISPLAY=$DISPLAY xmessage cooker” | at “NOW + 30 minutes”	Popup reminder
locales
•	printf “%’d\n” 1234	Print number with thousands grouping appropriate to locale
•	BLOCK_SIZE=\’1 ls -l	get ls to do thousands grouping appropriate to locale
•	echo “I live in `locale territory`”	Extract info from locale database
•	LANG=en_IE.utf8 locale int_prefix	Lookup locale info for specific country. See also ccodes
•	locale | cut -d= -f1 | xargs locale -kc | less	List fields available in locale database
recode (Obsoletes iconv, dos2unix, unix2dos)
•	recode -l | less	Show available conversions (aliases on each line)
	recode windows-1252.. file_to_change.txt	Windows “ansi” to local charset (auto does CRLF conversion)
	recode utf-8/CRLF.. file_to_change.txt	Windows utf8 to local charset
	recode iso-8859-15..utf8 file_to_change.txt	Latin9 (western europe) to utf8
	recode ../b64 < file.txt > file.b64	Base64 encode
	recode /qp.. < file.txt > file.qp	Quoted printable decode
	recode ..HTML < file.txt > file.html	Text to HTML
•	recode -lf windows-1252 | grep euro	Lookup table of characters
•	echo -n 0×80 | recode latin-9/x1..dump	Show what a code represents in latin-9 charmap
•	echo -n 0x20AC | recode ucs-2/x2..latin-9/x	Show latin-9 encoding
•	echo -n 0x20AC | recode ucs-2/x2..utf-8/x	Show utf-8 encoding
CDs
	gzip < /dev/cdrom > cdrom.iso.gz	Save copy of data cdrom
	mkisofs -V LABEL -r dir | gzip > cdrom.iso.gz	Create cdrom image from contents of dir
	mount -o loop cdrom.iso /mnt/dir	Mount the cdrom image at /mnt/dir (read only)
	cdrecord -v dev=/dev/cdrom blank=fast	Clear a CDRW
	gzip -dc cdrom.iso.gz | cdrecord -v dev=/dev/cdrom -	Burn cdrom image (use dev=ATAPI -scanbus to confirm dev)
	cdparanoia -B	Rip audio tracks from CD to wav files in current dir
	cdrecord -v dev=/dev/cdrom -audio *.wav	Make audio CD from all wavs in current dir (see also cdrdao)
	oggenc –tracknum=’track’ track.cdda.wav -o ‘track.ogg’	Make ogg file from wav file
disk space (See also FSlint)
•	ls -lSr	Show files by size, biggest last
•	du -s * | sort -k1,1rn | head	Show top disk users in current dir. See also dutop
•	df -h	Show free space on mounted filesystems
•	df -i	Show free inodes on mounted filesystems
•	fdisk -l	Show disks partitions sizes and types (run as root)
•	rpm -q -a –qf ‘%10{SIZE}\t%{NAME}\n’ | sort -k1,1n	List all packages by installed size (Bytes) on rpm distros
•	dpkg-query -W -f=’${Installed-Size;10}\t${Package}\n’ | sort -k1,1n	List all packages by installed size (KBytes) on deb distros
•	dd bs=1 seek=2TB if=/dev/null of=ext3.test	Create a large test file (taking no space). See also truncate
•	> file	truncate data of file or create an empty file
monitoring/debugging
•	tail -f /var/log/messages	Monitor messages in a log file
•	strace -c ls >/dev/null	Summarise/profile system calls made by command
•	strace -f -e open ls >/dev/null	List system calls made by command
•	ltrace -f -e getenv ls >/dev/null	List library calls made by command
•	lsof -p $$	List paths that process id has open
•	lsof ~	List processes that have specified path open
•	tcpdump not port 22	Show network traffic except ssh. See also tcpdump_not_me
•	ps -e -o pid,args –forest	List processes in a hierarchy
•	ps -e -o pcpu,cpu,nice,state,cputime,args –sort pcpu | sed ‘/^ 0.0 /d’	List processes by % cpu usage
•	ps -e -orss=,args= | sort -b -k1,1n | pr -TW$COLUMNS	List processes by mem usage. See also ps_mem.py
•	ps -C firefox-bin -L -o pid,tid,pcpu,state	List all threads for a particular process
•	ps -p 1,2	List info for particular process IDs
•	last reboot	Show system reboot history
•	free -m	Show amount of (remaining) RAM (-m displays in MB)
•	watch -n.1 ‘cat /proc/interrupts’	Watch changeable data continuously
system information (see also sysinfo) (‘#’ means root access is required)
•	uname -a	Show kernel version and system architecture
•	head -n1 /etc/issue	Show name and version of distribution
•	cat /proc/partitions	Show all partitions registered on the system
•	grep MemTotal /proc/meminfo	Show RAM total seen by the system
•	grep “model name” /proc/cpuinfo	Show CPU(s) info
•	lspci -tv	Show PCI info
•	lsusb -tv	Show USB info
•	mount | column -t	List mounted filesystems on the system (and align output)
•	grep -F capacity: /proc/acpi/battery/BAT0/info	Show state of cells in laptop battery
#	dmidecode -q | less	Display SMBIOS/DMI information
#	smartctl -A /dev/sda | grep Power_On_Hours	How long has this disk (system) been powered on in total
#	hdparm -i /dev/sda	Show info about disk sda
#	hdparm -tT /dev/sda	Do a read speed test on disk sda
#	badblocks -s /dev/sda	Test for unreadable blocks on disk sda
interactive (see also linux keyboard shortcuts)
•	readline	Line editor used by bash, python, bc, gnuplot, …
•	screen	Virtual terminals with detach capability, …
•	mc	Powerful file manager that can browse rpm, tar, ftp, ssh, …
•	gnuplot	Interactive/scriptable graphing
•	links	Web browser
•	xdg-open http://www.pixelbeat.org/	open a file or url with the registered desktop application
miscellaneous
•	alias hd=’od -Ax -tx1z -v’	Handy hexdump. (usage e.g.: • hd /proc/self/cmdline | less)
•	alias realpath=’readlink -f’	Canonicalize path. (usage e.g.: • realpath ~/../$USER)
•	set | grep $USER	Search current environment
	touch -c -t 0304050607 file	Set file timestamp (YYMMDDhhmm)
•	python -m SimpleHTTPServer	Serve current directory tree at http://$HOSTNAME:8000/

Regular Expressions Help

Perl Compatible Regular Expressions

Syntax

Characters

Wildcards

Boundaries

Grouping

Extensions

Quantifiers

Greedyness

Quoting

Replacing

Flags

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