remove the contents of a file

Hi
Let say a flat file contains 1000 lines. The cursor is at the 530 line number.
Now I like to delete all the line at one ahot. how it can be done?

You want to empty the file ?

At the prompt give

> file.name

Within the editor (say vi), give

:g/.*/d

or u can type something like this:

# cat /dev/null > filename

where "filename" is the file u want to empty at one shot :smiley: