utc date time

to get the utc date and time of the current system enter "date -u" on the command line.

ascii character code

found this little tidbit to help out a friend.

to find the ascii representation of a character in vim, place the cursor over the character and enter ":ascii".

for more info on this vim feature, enter ":help ascii" in vim.


to accomplish the same thing from the command line, "echo" the character and pipe to "od" (read the man page).

Burn cd iso to disk

reference: Burning ISO images

### update 2010-10-01 ###

find cd burning device
>wodim --devices

burn iso to device
>cdrecord -v -eject speed=4 dev=/dev/scd0 /path/to/file.iso

###################

find cd burning device
>cdrecord -scanbus
then
>cdrecord -scanbus dev=ATA

burn iso to device
>cdrecord -v -eject speed=4 dev=ATA:0,2,0 /path/to/file.iso

Vim RegEx Search and Replace

I have the following text:

obj.getHost()
obj.getYourHost()
obj.setHost()
obj.setYourHost()

I want to change getHost() and setHost() to getMyHost() and setMyHost(). However, I do NOT want to change getYourHost() nor setYourHost().

Following is the regex I constructed to make the change:

:1,4s/\.[sg]et\(Your\)\@!/&My/g

\.[sg]et is the part of the expression that matches either .get or .set
\(Your\)\@! is the part of the expression that is key to matching getHost() but not getYourHost()
& is the part of the expression that takes what is matched and places that match in the replacement
g means to apply the search and replace to all matches on each line


links: Vim Help
Positive and Negative Lookahead

mount windows network share on linux using cifs

below is the command i used to mount a windows network share on a centos linux system. this is work on any linux distro


> mount -t cifs //nas/share /mnt/point -o user=username,uid=some_user,gid=some_group,rw

vimrc customizations

below are the vim customizations I place in my vimrc file

set foldmethod=marker
set nobackup
set nowritebackup
set background=dark
set number

Build Python 2.6 on CentOS 5.3

Build Python 2.6 on CentOS 5.3

download python 2.6.2 tarball
extract python 2.6.2 tarball to /usr/src
E.g., tar -xvjf /share/download/Python-2.6.2.tar.bz2 -C /usr/src

> cd /usr/src/Python-2.6.2
> ./configure
> make

make a symbolic link in /usr/bin for the python 2.6.2 interpreter
> ln -s /usr/src/Python-2.6.2/python /usr/bin/python26

verify that the correct python interpreter is executed
> python26

verify that python 2.6.2 appears in the heading