Month: June 2006

[problem]

You want to create a favicon.ico from Unix.

[/problem]

[solution]

1. Open your image with GIMP
2. If your image is not a square then resize the canvas with GIMP
3. Scale the image to 16×16 pixel (Image, Scale image)
4. Save as favicon.pnm or favicon.ppm with raw encoding
5. Close GIMP

[/solution]

[example]

Then to convert favicon.pnm or favicon.ppm using the command line utility ppmtowinicon:

 $ ppmtowinicon -output favicon.ico favicon.pnm 

Or

 $ ppmtowinicon -output favicon.ico favicon.ppm 

[/example]

[reference]

Kewl tip on creating a favicon.ico with ppmtowinico – thanks to linuxproblem.org. 🙂

http://www.linuxproblem.org/art_19.html

[/reference]

[problem]

One annoying thing I recently discovered, when copying code from my blogs (yes I use my own tips too! 🙂 ), quotes seem to turn into dots. Both for single and double quotes.

[/problem]

[solution]

The answer to this was explained in a blogging book, that apparently the quotes on a keyboard refer to feet and inches – not speech! 😉

The solution is simply to use ASCII notation.

[/solution]

[example]

Therefore a double quote becomes " and a single '

[/example]

[reference]

[/reference]

[problem]

You want to perform command line display of mysql dbs with mysqlshow.

[/problem]

[solution]

Is this demo, I show the options for mysqlshow.

mysqlshow is a real easy way to quickly view your dbs, tables and rows.

[/solution]

[example]

Show Databases

 $ mysqlshow -i -u'root' -p'xxxxxx' +---------------+ |   Databases   | +---------------+ | demo          | | mysql         | | test          | +---------------+ 

Show number of tables under each db

 $ mysqlshow -v -i -u'root' -p'xxxxx' +---------------+--------+ |   Databases   | Tables | +---------------+--------+ | demo          |      1 | | mysql         |     15 | | test          |      0 | +---------------+--------+ 5 rows in set. 

Show total number of rows for each db

 [marcus@bagend ~]$ mysqlshow -v -v -i -u'root' -p'xxxxx' +---------------+--------+--------------+ |   Databases   | Tables |  Total Rows  | +---------------+--------+--------------+ | demo          |      1 |            7 | | mysql         |     15 |         1383 | | test          |      0 |            0 | +---------------+--------+--------------+ 5 rows in set. 

[/example]

[problem]

You want to know how to do the following, through mysql command line interface:

Connect to the mysql daemon

Show the databases your user has access

Show tables defined under that db

Show schema for given table

[/problem]

[example]

 mysql -u'username' -p'password' -h'mysql_host' 

mysql_host is optional if the daemon is running on the same host.

Show databases

 show databases; 

Show tables

 show tables; 

Describe tables

 use demo; describe demo; 

For example:

 mysql> show databases; +----------+ | Database | +----------+ | demo     | | test     | +----------+ 2 rows in set (0.00 sec)  mysql> use demo;  Database changed mysql> show tables; +----------------+ | Tables_in_demo | +----------------+ | demo_table     | +----------------+ 1 row in set (0.00 sec)  mysql> desc demo_table; +-------+--------------+------+-----+---------+-------+ | Field | Type         | Null | Key | Default | Extra | +-------+--------------+------+-----+---------+-------+ | id    | mediumint(9) |      | PRI | 0       |       | | day   | varchar(20)  |      |     |         |       | | val   | tinyint(4)   |      |     | 0       |       | +-------+--------------+------+-----+---------+-------+ 3 rows in set (0.10 sec) 

[/example]

[problem]

You want a simple bit of java code that takes arguments from the command line and displays them.

[/problem]

[solution]

Good demo on how to obtain and handle java arguments.

  public class Arguments {    public static void main(String argv[]) {      if(argv.length > 0) {        System.out.println("args exec w " + argv.length + " args");          for(int i=0;i... 

[/solution]

[example]

Here is a demo:

 # java Arguments -a -x -y args exec w 3 args argv[0] = -a argv[1] = -x argv[2] = -y 

[/example]