Help with unix commands

Kaak · November 10, 2003, 10:58

I'm trying to use sed, and it asks me to print all lines where b-days are in November or December. The way the input file is set up,

sed -n '/^[^:]*:[^:]*:[^:]*:11/p' databook

gives me the b-days in november, i just don't know how to make it do an "or" to get both. any ideas?

Ari Rahikkala · November 10, 2003, 11:36

I dunno how to do this portably, but in GNU sed you can use \| to match "either", like so:

/^[^:]*:[^:]*:[^:]*:$11$\|$12$/p

Provost Harrison · November 10, 2003, 12:06

Thankyou for reminding me why I never have used Linux...

Paul Hanson · November 10, 2003, 12:10

Just because you're not l33t enough...

Urban Ranger · November 10, 2003, 12:40

Quote:

Originally posted by Provost Harrison
Thankyou for reminding me why I never have used Linux...

That's just a regular expression. Not more complicated than most of the biochem stuff.

Q Classic · November 10, 2003, 12:43

paul hanson
provost harrison

both with eu markings...

confusing.

Paul Hanson · November 10, 2003, 12:46

You think that's bad? We both spend a lot of time in the same city as well.

Whaleboy · November 10, 2003, 13:49

God I'm so glad I'm back to WinXP

Kaak · November 10, 2003, 14:01

thanks

Urban Ranger · November 10, 2003, 23:35

Quote:

Originally posted by Whaleboy
God I'm so glad I'm back to WinXP

For what? You don't need to know regex to use *nix.

Ari Rahikkala · November 11, 2003, 05:11

Ah, of course, Doing it this way you don't need GNU extensions, AFAICT:

/^[^:]*:[^:]*:[^:]*:1[12]/p

Every time I use nonstandard extensions (such as the stuff GNU has added to so many *nix tools) anywhere I hear a little BSD daemon shouting at me about hypocrisy...

Fve Crathva · November 11, 2003, 05:18

Out of curiosity, would this also work?

/^(.*?:){3}1[12]/p

SP

Provost Harrison · November 11, 2003, 06:47

Quote:

Originally posted by Paul Hanson
Just because you're not l33t enough...

That is true, I am always on time

Provost Harrison · November 11, 2003, 06:52

Quote:

Originally posted by Paul Hanson
You think that's bad? We both spend a lot of time in the same city as well.

Except you spend your weekdays in Hull working (well, uni) and home in Lincolnshire on the weekends, whereas I spend my weekdays in Lincolnshire working and my weekends at home in Hull

Paul Hanson · November 11, 2003, 06:55

Well, I'm actually spending more time in Hull this year. Not because I've developed an affinity for the place, but because my family drive me nuts.

Provost Harrison · November 11, 2003, 07:18

Enjoy Hull...some of us are having to spend more time in Grimsby. It makes you appreciate the place

Pekka · November 11, 2003, 07:27

kaak@kaak.net>I commaaand youu to obeyyy they woord of the Lord, which tells you to CHANGE DIRECTORY!

There are soem more basic commands, so what do you need?

Ari Rahikkala · November 11, 2003, 08:42

Well, it was inevitable, I decided to start testing these regexes...

$ cat databook
0:04:01:10:wh00t
0:10:12:05:l33t-2003
0:01:01:01:666
0:04:15:11:324
0:04:15:12:k3wl

$ sed -n '/^[^:]*:[^:]*:[^:]*:11/p' databook
0:04:15:11:324

This one prints November's records, as it's supposed to...

$ sed -n '/^[^:]*:[^:]*:[^:]*:$11$\|$12$/p' databook
0:10:12:05:l33t-2003
0:04:15:11:324
0:04:15:12:k3wl

I'l figure out why this one produces wrong results later, if I can be bothered... (it probably picks up the 12 in the third column for some reason)

$ sed -n '/^[^:]*:[^:]*:[^:]*:1[12]/p' databook
0:04:15:11:324
0:04:15:12:k3wl

This one does exactly what it's supposed to do.

$ sed -n '/^(.*?:){3}1[12]/p' databook

And this one doesn't seem to do anything... however, a fixed version of it does:

$ sed -n '/^$.*:$\{3\}1[12]/p' databook
0:04:15:11:324
0:04:15:12:k3wl

As does a version that might be safer, or then not, I'm not really sure:

$ sed -n '/^$[^:]*:$\{3\}1[12]/p' databook
0:04:15:11:324
0:04:15:12:k3wl

No, I for one have not understood sed's rules about what needs to be escaped and what not in regexes...

Provost Harrison · November 11, 2003, 11:20

You're all such a bunch of nerds...

Ari Rahikkala · November 11, 2003, 11:41

I'm almost ashamed about the acts of l33tism I committed. I guess I've picked it up at the Gentoo forums where the user levels are in l33t, probably (hopefully) as a joke...

Whaleboy · November 11, 2003, 11:51

What is l33t?

Provost Harrison · November 11, 2003, 12:13

Very, very sad Whaleboy, very, very sad. You've proven your credibility by not knowing what it is

Urban Ranger · November 11, 2003, 23:32

He's just playing dumb Rich.

Fve Crathva · November 12, 2003, 03:31

^$[^:]*:$\{3\}1[12] would be safer than ^$.*:$\{3\}1[12], but something can be said for using unsafe REs as an input debugging tool; does sed not know about non-greedy matching?

I think I'll stick to Perl. Oh, yes.

SP

Nubclear · November 12, 2003, 03:46

([3^4]*1:2(4)])$^¨b12

Fve Crathva · November 12, 2003, 04:09

Sicko.

SP