Comments on clipboarded: command line quizzes part 2

Hi mats, you're right, I shouldn't have been check...

2008-02-17T07:18:00.000-06:00

Hi mats, you're right, I shouldn't have been checking to see they define the same set.

So I'd change the "cmp -s" for "comm -12", drop the "|| echo..." bit, and leave everything else the same. That will list those that are duplicates.

Cheers, Ralph Corderoy.

Hey Ralph,The idea is to find out if a class is de...

2008-02-16T16:45:00.000-06:00

Hey Ralph,
The idea is to find out if a class is defined in multiple places. I think your solution would almost always say the two files differ, which isn't helpful. Of course the wording of the question was ambiguous so I changed it.

Also, it's hard to know whether or not defining a class twice in the same file is a mistake. Sometimes it is, sometimes it's not, which is why I grep the files and display the results so the user knows where were the duplicates.

I don't know CSS-syntax precisely but here's a sta...

2008-02-16T08:57:00.000-06:00

I don't know CSS-syntax precisely but here's a stab based on stripping everything after the open brace.

$ classnames() { sed 's/{.*//; y/ /\n/' "$@" | grep '^\.' | sort -u; }
$ classnames <first.css
.article
.footer
.header
.left
.main
$

$ cmp -s <(classnames first.css) <(classnames first.css) || echo they differ
$ cmp -s <(classnames first.css) <(classnames second.css) || echo they differ
they differ
$

The question was if the two define the same classes. The same class being defined more than once in the same file is presumably not a problem but I think the original will treat it as an error.

Cheers, Ralph Corderoy.

You're absolutely right. I changed the main post w...

2008-02-15T17:52:00.000-06:00

You're absolutely right. I changed the main post with your version.

For the first one,top -b -n 1 | awk 'NR >= 8 && $9...

2008-02-15T08:54:00.000-06:00

For the first one,

top -b -n 1 | awk 'NR >= 8 && $9 > 25 {print $1}' | xargs -r kill

Why do you use xargs? It's doing nothing useful in your version. Idiomatic awk scripts make use of the `pattern action' style of programming. tail was redundant given it was being used to skip lines at the start and awk can do that simply. xargs's -r option stops kill from given the usage message.