Re: How to randomize a list?

[Christopher Stone]

On 01/14/2018, at 15:31, Sam Hathaway > wrote:
> Try replacing the contents of your “Randomize” text filter with:
> #!/usr/bin/env perl
> use List::Util 'shuffle';
> print shuffle();


Hey Vlad,

I'm with Sam, although I'd write it slightly differently.

#!/usr/bin/env perl -sw
use List::Util 'shuffle';
print shuffle <>;

The main thing here is to turn on the strict and warnings switches, although 
I've also abbreviated STDIN and used a less formal call to shuffle().

--
Take Care,
Chris


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Re: How to randomize a list?

[Sam Hathaway]

On 15 Jan 2018, at 0:46, Vlad Ghitulescu wrote:

(sorry for the following dumb questions… I've used Linux last time 
in 1993! :-)

What are the GNU Coreutils good for?

Should I install them too? (I've read about the difference in the 
performance of the various randomizer solutions in the previous cited 
StackOverflow-threads)

And if so, how?


They provide roughly the same functionality as the standard UNIX 
utilities that come with macOS. (Which come from a BSD lineage.) I like 
them because I used Linux for years and get tripped up by the 
differences in the command-line interfaces. If you don’t have this 
problem, then I don’t think there’s a good reason to install the GNU 
versions.


The Perl solution should be fine for your purposes. It will randomize 
correctly (unlike `sort -R`, which actually sorts by an arbitrary, but 
not random, characteristic of the data), and performance should be 
acceptable.


That worked even whitout making the file Randomize.sh executable with 
chmod +x Randomize!

Take a look:

Vlads27iMac2012:Text Filters Vlad$ ls -al
total 48
drwxr-xr-x@  5 Vlad  staff  170 14 Jan 21:17 .
drwxr-xr-x@ 17 Vlad  staff  578 15 Jan 06:44 ..
-rwxr-xr-x@  1 Vlad  staff  111  1 Nov  2016 
Delete_Viewed_Video_in_Lynda_TOC.pl

-rwxr--r--@  1 Vlad  staff   69 15 Jan 06:32 Randomize.sh
-rwxr-xr-x@  1 Vlad  staff   80  4 Nov  2015 
Selection_To_Numbered_List.sh


How is this possible?


See the `x` in column 4? That indicates that `Randomize.sh` is in fact 
executable, _by the owner_ (you). BBEdit also runs as you, so it can 
execute the script just fine.


Just a note: BBEdit doesn’t care, but to avoid future human confusion 
you might want to change `Randomize.sh` to `Randomize.pl` since it’s a 
Perl script now.

-sam

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Re: How to randomize a list?

[Jean-Christophe Helary]

> On Jan 15, 2018, at 14:46, Vlad Ghitulescu  wrote:
> 
> What are the GNU Coreutils good for?

They are common Linux utilities of which some BSD equivalents are present on 
macOS.

https://www.gnu.org/software/coreutils/manual/coreutils.html

> Should I install them too? (I've read about the difference in the performance 
> of the various randomizer solutions in the previous cited 
> StackOverflow-threads)
> And if so, how?

homebrew

https://apple.stackexchange.com/questions/69223/how-to-replace-mac-os-x-utilities-with-gnu-core-utilities

> That means that the "stock macOS" on my Sierra 10.12.6 are older than… what?

:) High Sierra ?

I never used sort -R before, but as I wrote the manual has 2015 as a date and 
Sierra was released in 2016, so I guess Apple saw fit to upgrade sort for High 
Sierra.

Would you mind checking the date at the end of the sort man page on your 
machine?


Jean-Christophe Helary
---
@brandelune http://mac4translators.blogspot.com


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