Jtdylktuy

I think the complete answer is more of a combination of the above.

-X (later --sort=extension) has been supported in Linux since at least FC3 and will sort based on extension. --group-directories-first was added more recently (maybe around FC8?). However, combining the two doesn't seem to work (at least on FC8).

The primary issue seems to be with the use of singular primary sort keys. See this mailing list discussion for some insight into it.

On Linux,

$ ls --group-directories-first

(man ls is your friend!)

-X is the option you're looking for:

ls -lX

On bash, this will sort of work:

$ ls | rev | sort | rev

From man rev:

 The rev utility copies the specified files to the standard output,

 reversing the order of characters in every line.  If no files are speci-

 fied, the standard input is read.

So
1. ls gives its output, with any flags you want
2. each line is reversed
3. then they're sorted
4. and reversed again
5. like this:

5. like this:


6. each line is reversed


7. then they're sorted


8. and reversed again
   So


9. ls gives its output, with any flags you want

Or, more to the point, as below. They're sorted by last character, then next-to-last, etc. All the .rtf files, for example, are listed together, after a .save file and another file with no extension whose name ends in 'e'. Then come .png files, and so on. This will also work with ls -l, because the extension is normally the last thing on the line (exceptions if you have lines like "tmp@ -> /home/jones/tmp", where links are followed by their targets).

 $ ls | rev|sort|rev

 cslu1

 ls.mp2

 ls.mp3

 ls.mp4

 trees_110214-15

 PAT

 CSLU

 Proxy Form.doc

 finannbyid

 toannbyid

 101209ssi.txt.save

 to_annotate_size

 Matas-time-by-week-integration2.rtf

 cyp3.rtf

 data-dir-scan.perl.doc.rtf

 whence-r21-numid.rtf

 platypus.rtf

 Screen shot 2011-01-21 at 2.17.50 PM.png

 emacs print help.png

 log

 new_month_log

 special

 Google-ngram-critique.html

 perl_path.html

 nl

 DWE_BEN_89808.2.ann

 foo

 d.o.foo

 100811_from_iMac_Documents_in_dock.zip

 to-palikir.zip

 tmp

 file-cleanup

 bar

 data-scan-docs

 cmp-mg-ann-numids

 finished_numids

 to_annotate_numids

 manls.ps

 Mike_address_ticket

 cyp2.out

 cyp3.out

 locate-cyp.out

 manls.out

 DWE_BEN_89808.2.text

 tag2.txt

 l2.txt

 du-h-d3.txt

 finished_ann_numids_110407_1714.txt

 finished_all_numids_110407_1718.txt

 data-dir-scan.perl.doc.txt

 whence-r21-numid.txt

 finannid.txt

 toannid.txt

 b9-workspace-anndiff.txt

 tag.txt

 duh.txt

 d.o-mail.txt

 safextn.txt

 mg3longhdr.txt

 finished_numids.txt

 41692-langnames.txt

 TimeAnnotationGuidelines.txt

 41langs.txt

 thing4-homedir-links.txt

 bnlinks.txt

 grants.txt

 mata-file-reports.txt

 logx.txt

 logx

 b9-workspace-anndiff.txt~

 bnlinks.txt~ 

If you're not on linux,

ls -l |sort -d -k 1.1,1.1r -k 9 |awk '{print $9}'

should sort directories first (let me know if I'm wrong). Doesn't sort by extension, though: you have to make the awk statement a lot busier if you want to do that ...

To also make it work with names containing spaces, I would probably replace the awk with something like sed -E -e 's/([^ ]+[ ]+){8}//' to strip out the first 8 fields instead of printing the 9th