As is usual for Unix utilities, ls has many command parameters.
'ls -laF' prints a detailed list with file sizes and owners. I add the '-laF'
to an alias in my ~/.bashrc file so I don't have to type the extra characters
'ls -m' prints filenames separated by commas
'ls -r' reverses the order of some options. For example, ls -tr prints oldest
files first
'ls -Sr' lists smallest files first. 'ls -laFtr' will do it in detail.
'ls -r' used by itself lists files in reverse lexicographic order. That's not
quite the same as reverse alphabetical order, depending on the system, country
code, and character set, but it's close enough.
~/.thunderbird/0ukmglzz.default/Mail/mail.aristotle.net
Every now and then I need to go to the mail directory, and have to find it in the hidden dot-directory, then negotiate the randomly named directory to bore down to where my mail is. Neither program allows changing the mail location.
I could have created an alias command for bash, but I decided to use a soft link. Soft links make a file or directory (to Linux they're the same thing) show up in two places at once. So I wanted to make my mail appear one level below my home directory.
Many Linux programs assume your mail directory is ~/mail, ~/Mail, or ~/.mail. I didn't particularly want any other programs gumming my mail files, so I chose the name "thud" for the Thunderbird mail link.
At the command prompt:
ln -s ~/.thunderbird/0ukmglzz.default/Mail/mail.aristotle.net ~/thud
Now a quick peek to make sure it worked correctly:
ls -laF ~/thud
...and there it is!