How to Sort a file for given situation?

vishalpatel03 · #1 (**permalink**) 11-25-2007

Hi
All,

How can you sort a file that is doubled space ( where even number lines are blank lines) and still preserves the blank lines?
You can use grep,sed and regular expression.

Thanks
Vishal

gus2000 · #2 (**permalink**) 11-25-2007

Well...you can't. All you can do is sort the file and then put the doublespacing back.

Code:

sort foo.bar | sed '/^$/d;G'

vishalpatel03 · #3 (**permalink**) 11-25-2007

Can You please explain with example like what type of content in foo.bar and how it work?

Thanks
Vishal

gus2000 · #4 (**permalink**) 11-25-2007

Hmmm, I think you'll learn it better if you just try it out yourself. But:

/^$/ matches blank lines (beginning of line followed by end of line)

d; deletes the line(s) that matched the pattern; starts a new command

G adds a newline

Good luck with the rest of your homework.

V3l0 · #5 (**permalink**) 11-26-2007

I don't understand the question

Are you able to use 'sort' ?
Please give me an example.

Thx

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