Tom Luo

Dictionary using dictd on Ubuntu

admin — Sat, 14 Apr 2012 17:48:52 +0000

1. Save the script as d.php in /var/www/
2. Install PHP if it has not been installed.
3. Install dictd server
4. Edit the database list
sudo vi /var/lib/dictd/db.list
5. Restart dictd server
sudo /etc/init.d/dictd restart
6. http://your_ip/d.php

It’s best viewed from iPad





Tom Luo 2012 - dictionary






Enter word to search: " type="text" name="query" onChange="submit()">

&1",$output,$error);
	$output = implode("\n",$output);
	if($error) {
		echo "Error: $output
";
	}
	else {
		if (preg_match("/no definitions found/i",$output)) {
			# turn suggested alternatives into links
			$output = preg_replace("/(: +)(\w+)/",
				"\\1\\2",$output);
			echo "$output";
		}
		else {
			# bold first line
			$output = preg_replace("/^(.*)/","\\1",$output);
			# wrap first line of each reference in table to control background color
			$output = preg_replace("/(\n\nFrom )(.*)\n/","\n\n\\2",$output);
			# find and process document internal links
			$output = preg_replace("/\{+(.*?)\}+/s",
				"\\1",$output);
			echo "$output";
		}
	}
}
?>

Interactive server-side Python shell for Google App Engine

admin — Wed, 04 Apr 2012 04:03:11 +0000

http://shell.appspot.com/

Query wiki from command line

admin — Thu, 12 Jan 2012 05:09:35 +0000

#!/usr/bin/env python __author__ = "Tom Luo" __version__ = "$Revision 0.1 $" __date__ ="$Date: 2012/01/11 11:11PM MST$" import os, urllib, sys import re def f(s): return s.find('remove the lines that containt this string') < 0 #url = 'http://en.wikipedia.org/wiki/' + '_'.join(sys.argv[1:]) url = 'http://en.wikipedia.org/w/index.php?search=' + '+'.join(sys.argv[1:]) fobj= os.popen("lynx -dump -width=120 %s" % url) output = fobj.read() fobj.close() start = output.find("From Wikipedia, the free encyclopedia") end = output.find("Terms of use for details") lines = output[start:end] lines = reversed(re.split('\[\d+\]',lines)) lines = filter(f,lines) print '.'.join(lines)

Save the above script as wiki
Examples

$chmod +x wiki $wiki china $wiki barack obama $wiki austin tx $wiki salem oregon

Google from command line

admin — Thu, 05 Jan 2012 06:09:35 +0000

#!/usr/bin/env python __author__ = "Tom Luo" __version__ = "$Revision 0.1 $" __date__ ="$Date: 2012/01/04 11:11PM MST$" import os, urllib, sys import re def f(x): return x.find('Cached') < 0 filename = 'http://www.google.com/search?' + urllib.urlencode({'q': ' '.join(sys.argv[1:]) }) fobj= os.popen("lynx -dump -width=120 %s" % filename) output = fobj.read() fobj.close() start = output.find("Web Results 1 - 10") end = output.find("Searches related to:") lines = output[start:end] lines = reversed(re.split('\[\d+\]',lines)) lines = filter(f,lines) print '.'.join(lines)

chmod +x g.sh g.sh oracle

Install Shellinabox on Ubuntu

admin — Fri, 30 Dec 2011 05:39:51 +0000

1. Download the installer
wget http://shellinabox.googlecode.com/files/shellinabox_2.10-1_i386.deb

2. Change the default port number if you like
/etc/default/shellinabox so that the default port is 443.

Then restart the shellinabox daemon:
sudo invoke-rc.d shellinabox restart

Access shellinabox server from my phone: https://your_home_internet_ip

Google-like spell suggestion

admin — Wed, 28 Dec 2011 06:11:46 +0000

I was reading Peter Norvig’s article on Boxing Day.

I simply added the __main__ section and used it to do my spell checking from shell.

Download big.txt from here.

#!/usr/bin/env python import re, collections def words(text): return re.findall('[a-z]+', text.lower()) def train(features): model = collections.defaultdict(lambda: 1) for f in features: model[f] += 1 return model NWORDS = train(words(file('big.txt').read())) alphabet = 'abcdefghijklmnopqrstuvwxyz' def edits1(word): splits = [(word[:i], word[i:]) for i in range(len(word) + 1)] deletes = [a + b[1:] for a, b in splits if b] transposes = [a + b[1] + b[0] + b[2:] for a, b in splits if len(b)>1] replaces = [a + c + b[1:] for a, b in splits for c in alphabet if b] inserts = [a + c + b for a, b in splits for c in alphabet] return set(deletes + transposes + replaces + inserts) def known_edits2(word): return set(e2 for e1 in edits1(word) for e2 in edits1(e1) if e2 in NWORDS) def known(words): return set(w for w in words if w in NWORDS) def correct(word): candidates = known([word]) or known(edits1(word)) or known_edits2(word) or [word] return max(candidates, key=NWORDS.get) if __name__ == "__main__": import sys import os os.system('clear') if len(sys.argv) == 1 : print "usage: spell word" else: s = sys.argv[1] print s print "Did you mean %s?" % correct(s)

Access PI from Python

admin — Sun, 13 Nov 2011 14:02:33 +0000

# Python PISDK test on Python 3.x
# Install Python extension for Windows

import win32com.client import time pi_sdk = win32com.client.Dispatch('PISDK.PISDK') conn = win32com.client.Dispatch('PISDKDlg.Connections') pi_server = pi_sdk.Servers('my_pi_server') # PI server or collective name conn.Login(pi_server,'pidemo','',1,0) # using point tag: SINUSOID (pre-configured by default in demo PI server) pi_point = pi_server.PIPoints['SINUSOID'] # retriving recorded data for the last 6 hours: recorded_values = pi_point.Data.RecordedValues('*-2h','*',3,"",0,None) time.sleep(0.1) # allow time for the call to complete. print (recorded_values.Count) for sample in recorded_values: v = sample.Value t = sample.TimeStamp.LocalDate print ("Value =",v, " (timestamp =",t,")") # Print Snapshot value pv = pi_point.Data.Snapshot print (pv.Value)

Seconds since midnight

admin — Thu, 01 Sep 2011 21:24:52 +0000

ORACLE:

select to_number(to_char(sysdate,'SSSSS')) from dual;

OSISofit PI Performance Equation
DaySec(‘*’)

shutdown – Ubuntu

admin — Fri, 19 Aug 2011 04:56:01 +0000

sudo gedit /etc/crontab

– shutdown at 10:00pm with 1 minute notice.
0 22 * * * root shutdown -h +1

Firebird Recursive Query – Tree

admin — Tue, 12 Jul 2011 03:00:10 +0000

Units conversion in Ubuntu

admin — Tue, 12 Jul 2011 01:56:16 +0000

#sudo apt-get install units

.units
2411 units, 71 prefixes, 33 nonlinear units

You have: 16 meters
You want: feet
* 52.493438
/ 0.01905
You have:

Press Ctr + d to exit

Many more interesting examples

How to Compile and run C# application on Ubuntu

admin — Mon, 30 May 2011 04:02:48 +0000

[sony]$cat hello.cs

using System; public class ParentClass { public ParentClass() { Console.WriteLine("Parent Constructor."); } public void print() { Console.WriteLine("I'm a Parent Class."); } } public class ChildClass : ParentClass { public ChildClass() { Console.WriteLine("Child Constructor."); } public static void Main() { ChildClass child = new ChildClass(); child.print(); } }

[sony]$gmcs hello.cs

[sony]$mono hello.exe
Hello C#

VBScript DateDiff

admin — Thu, 26 May 2011 04:39:02 +0000

DateDiff(interval,date1,date2[,firstdayofweek[,firstweekofyear]])

Notes:

1. interval ‘m’ stands for month, use ‘n’ for seconds

2. returns a negative nubmer if date1 < date2, otherwise, positve

Parameter Description
interval The interval you want to use to calculate the differences between date1 and date2
Can take the following values:

yyyy – Year
q – Quarter
m – Month
y – Day of year
d – Day
w – Weekday
ww – Week of year
h – Hour
n – Minute
s – Second

Replace multiple spaces with one space – Python

admin — Thu, 26 May 2011 04:20:06 +0000

s=" Jennifer Lynn Lopez (born July 24, 1969), also known by her nickname J.Lo, is an American actress, singer" " ".join(s.split())

GROUP BY in Pentaho – GROUP_CONAT in MySQL or LISTAGG in Oracle

admin — Thu, 12 May 2011 19:01:27 +0000

Found a very useful feature in Pentaho Data Integration that is equivalent to the GROUP_CONAT function in MySQL or LISTAGG function in Oracle.
It can concatenate all rows into a string sepated by “,” or any character grouped by another field.

csharp on Ubuntu

admin — Wed, 27 Apr 2011 21:08:38 +0000

Ubuntu comes with Tomboy, Gbrainy and F-Spot, and therefore comes with Mono installed by default.

Mono provides a complete CLR (Common Language Runtime) including compiler and runtime, which can produce and execute CIL (Common Intermediate Language) bytecode (aka assemblies), and a class library. It contains the interactive C# shell named csharp. csharp permits dynamically evaluating C# statements, and can be used for writing scripts or testing code fragments.

You can install it if it’s not there.

sudo apt-get install mono-csharp-shell

csharp> using System; csharp> using System.Diagnostics; csharp> Process[] runningProcs = Process.GetProcesses("."); csharp> foreach (Process p in runningProcs) > { > string info = string.Format("{0} {1}", p.Id, p.ProcessName); > Console.WriteLine(info); > }

1 /sbin/init
2 kthreadd
3 ksoftirqd/0
4 migration/0
5 watchdog/0
6 events/0
7 cpuset
8 khelper
9 netns
10 async/mgr
11 pm
12 sync_supers
13 bdi-default
14 kintegrityd/0
15 kblockd/0
16 kacpid

OSIsoft PI String

admin — Thu, 21 Apr 2011 04:30:23 +0000

Not sure why max size of string is 976 characters.
This is the best guess I can think of.

(314*3.14)-10 975.96 #or pow(math.pi,2)*99 977.0908357078464

OSISoft PI Data Type of Point

admin — Thu, 21 Apr 2011 03:16:21 +0000

Data Type of Point: PointType Attribute

Int16
Points with integer values between 0 and 32767 (15-bit unsigned integers).
Int32
Points with integer values between -2147450880 and 2147483647 (32-bit signed integers).

Python code

int('111111111111111',2) 32767 int('1'*15, 2) 32767 int('1'*31,2) 2147483647 bin(2147483647) '0b1111111111111111111111111111111' bin(2147483647).count('1') 31 bin(-2147450880) '-0b1111111111111111000000000000000' bin(-2147450880).count('1') 16 bin(-2147450880).count('0') 16

Maximum number of rows allowed in MS Excel 2007

admin — Thu, 14 Apr 2011 03:00:41 +0000

pow(2,(8*2 + (2007-2003))) # or 1 << (16 + (2007-2003)) # or 1 << 20

Excel 2003 = 65,536 rows
Excel 2007 = 1,048,576 rows

Describe tables/views in Firebird

admin — Mon, 21 Mar 2011 14:49:56 +0000

To List all tables:

-- list all tables show table -- or -- describe a table show table TABLE_NAME select rdb$relation_name from rdb$relations where rdb$view_blr is null and (rdb$system_flag is null or rdb$system_flag = 0);

To List all views

select rdb$relation_name from rdb$relations where rdb$view_blr is not null and (rdb$system_flag is null or rdb$system_flag = 0);

To list all tables and columns

select f.rdb$relation_name, f.rdb$field_name from rdb$relation_fields f join rdb$relations r on f.rdb$relation_name = r.rdb$relation_name and r.rdb$view_blr is null and (r.rdb$system_flag is null or r.rdb$system_flag = 0) order by 1, f.rdb$field_position;