Re: Golf: reverse sort /etc/passwd by UID

[choroba]

Only suitable for a terminal, not to be redirected to a file:

#                 1         2         3         4
#        12345678901234567890123456789012345678901234
perl -e 'print sort map 9/(1+(split/:/)[2])."\r$_",<>' /etc/passwd

[tobyink]

Nice, but one of the lines in my /etc/passwd file comes out as:

1.52590218966964e-05\rnobody:x:65534:65534:nobody:/nonexistent:/bin/sh

And thus gets sorted after root.

[choroba]

OK, just change 1/ to 9/ (or 8 or 7). Updated.

[MidLifeXis]

Cool (and sneaky)!

Nice use of the features of how floats are printed and the behavior of a console. Could this run into problems with a very short passwd line?

1. Takes the third field
2. Adds one to avoid div by 0
3. Inverts it (1/X) to get the sort order correct
4. appends a carriage return (beginning of line)
5. appends the original line
6. sorts numerically lexically, but with all values being less than 1 it does not make a difference.
7. prints results

Update: Updated how sort happens.

Update 2: s/<ul>/<ol>/

[Tommy]

I'm not clear on how it sorts on a field in the text while at the same time appending the text to the field which is sorted. What am I missing here?

[choroba]

at the same time

Nothing is happening at the same time. The steps shown by MidLifeXis are ordered (maybe <ol> would have been better than <ul>). First, the text is concatenated, then it is sorted.

[Tommy]

Good gosh, can't even decipher that. Sorting the output of a map applying a mathematical expression to the list of lines on STDIN... but how do you discard the text it generated here --> (1+(split/:/)[2])<-- ??