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I know of two password generators in Debian. The first one which I have used is apg and it seems to generate some good passwords.

$ apg -m 15 -M SNCL
RefGav:quedTut7
{Shtetmigdybig1
vojkewth3OdTuv<
2quacyodoobEst+
pedBoyggyu2guv/
suj?Quonvewv7Om

I also tried pwgen similarly

$ pwgen -1csy 15
q#n?PPWEWp8+])'

OR

$ pwgen -1sy 15
rE'AmK8=n;s9Bv3

Now I have two questions instead of one, are there any shell/command-line based password generators known either in Debian or in the more wider GNU/Linux world (perhaps not packaged.)?

The other query is has there been any sort of comparisons made on the two password generators either on basis of their algorithm or the password-generating speed or something else entirely?

Looking forward to know.

1

Pwgen is a good choice but You can use the following command to generate the random password:

tr -dc A-Za-z0-9_ < /dev/urandom | head -c 16 | xargs

Sample outputs:

1z2G4SVmZOdd4uK4

Also you can use the following shell function to generate random password.

Edit ~/.bashrc file, enter:

$ vi $HOME/.bashrc

Append the following code:

genpasswd() {
    local l=$1
        [ "$l" == "" ] && l=16
        tr -dc A-Za-z0-9_ < /dev/urandom | head -c ${l} | xargs
}

Save and close the file.Source ~/.bashrc again, enter:

$ source ~/.bashrc

To generate random password, enter:

$ genpasswd

Sample outputs:

WGtkhETPJFZ2mtZk

To generate 8 character long random password, enter:

$ genpasswd 8

Sample outputs:

oj7Wqvb

Also you can use Aberystwyth University that has a pretty hardcore mnenomic-passsword generator.

example generated passwords :

ud5pwt.1    Ulrich's diabolic five praises Wendy's taciturn full stop lamely.
9y21%s@j    Nina's yellow zombie leads Percy's spurious at-sign joyfully.
lyw1osci    Lucy's yapping wolf lends one's smug creepy idea.
t4jhilh+    Tudor's fourth jumper hectors Isabel's listless haggard plus sign.
ngi.o1v_    Nia's garish ice stops Olga's first vengeful underscore.
rfint5*d    Ruth's flabby ice names Tracy's fifth star daily.
d&st,vvd    Douglas's handy salamander transforms Conner's vague villainous daffodil.
xe;2bba4    Xenia's enchanting semicolon zooms Bart's burly arcane four.
5p<kxhnf    Fife's pensive less than sign knits Xenia's hapless notorious fang.

Interesting work. You might like to email their sysops to see if the script behind it is freely available (and if it's not, whether they'd consider GPLing it)

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