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http://svnbook.red-bean.com/en/1.0/ch04s02.html
Answer:
In SVN, if you want to create a branch, you can use the following command.
# svn copy http://example.com/svn/repos/demo/trunk \
http://example.com/svn/repos/demo/branches/my-test-branch \
-m "My test branch for the 'demo' project."
Committed revision 125.
Simple timer in Linux
Answer:
To create a simple timer and return when time-up, use the following command.
# time read -t 3
real 0m3.000s
user 0m0.000s
sys 0m0.000s
Remove packages and config files in Ubuntu
Answer:
If you want to remove a package in Ubuntu, you can use apt-get remove, e.g.
# sudo apt-get remove php5
However, the config files will NOT be removed.
To remove the config files also, you can use apt-get purge, e.g.
# sudo apt-get purge php5
Is PHP's function name case-sensitive or case-insensitive?
Answer:
In PHP, the names of user defined classes/functions, as well as those built in language constructs/keywords such as echo, while, etc., are ALL case-insensitive, e.g.
echo "foo";
ECHO "foo";
eCho "foo";
They are all the same.
What is the difference between ip address 0.0.0.0 and 127.0.0.1?
Answer:
Sometimes when using the netstat command, which print out something like
# netstat -ntpl
(No info could be read for "-p": geteuid()=1001 but you should be root.)
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:25 0.0.0.0:* LISTEN -
...
What is the real meaning of 0.0.0.0?
In fact, this special IP means "all the IP addresses on the local machine". So if you have seen a service listening on 0.0.0.0, it means you can connect to the service using any IP addresses of the machine.
