Create a transparent image using ImageMagick
Answer:
You can use the following command to create an empty png file, using the ImageMagick.
# convert -size 100x100 xc:none empty.png
an empty png of size 100x100 will be created.
Aug 292011
Linux Ask!
Aug 272011
Edit a remote file with vim over SSH
Answer:
If you have a remote file and you can have a quick edit, if you use the following command:
# ssh -t john@remote-server vim /data/test.txt
You will be prompted to login if you don't have proper ssh key in the remote server, and after finishing editing the file, you will quit the ssh session automatically.
Aug 252011
Disable MySQL server from listening for TCP/IP connections
Answer:
If you only connect to the MySQL server from localhost and you might want to disable TCP/IP networking feature so the server is more secure.
To do so, edit the MySQL configurations, e.g. /etc/my.cnf
..
skip-networking
..Don't forget to restart MySQL to take effect.
# /sbin/service mysqld restart
Aug 232011
Check if a file exist in Bash Shell
Answer:
The following script demonstrates how to check if a file exist, using shell (Bash) script
#!/bin/bash
if [ -e test.txt ]
then
echo 'The file exists.'
else
echo 'The file does not exist.'
fi
Aug 212011
How to print screen in Mac OS X
Answer:
1. To print the whole screen in Mac OS X, try
Press down Apple key ⌘ + Shift + 3 at the same time
2. To print an active window
Press down Apple key ⌘ + Shift + 4 at the same time
When you see the mouse changed to +, press the space key in your keyboard.
3. To print a portion of your screen
Press down Apple key ⌘ + Shift + 4 at the same time
When you see the mouse changed to +, move your mouse to select the portion .
