$ pwgen --capitalize --numerals --symbols --secure -1 20 10
H'X#!HJ0^<$7*_pawa5#
};EYL`djT]cFh]d2xR@t
xm3c9VnjDM_[p:sC=SXN
pag<vE5'b]MILD.op5Hk
]%3B]%\k37m[zpdAo6/.
j]tygJW#_\s>XZ6wrqHC
F)qt9z@gNna/yBH>"zkz
'w=|a#bNbHLsW7uFe^,5
Mh<6>NV^58KAr+)P\Rui
imt{J)|;l$<Q{k\72B5(
Usage: pwgen [ OPTIONS ] [ pw_length ] [ num_pw ]
Options supported by pwgen:
-c or --capitalize
Include at least one capital letter in the password
-A or --no-capitalize
Don't include capital letters in the password
-n or --numerals
Include at least one number in the password
-0 or --no-numerals
Don't include numbers in the password
-y or --symbols
Include at least one special symbol in the password
-r <chars> or --remove-chars=<chars>
Remove characters from the set of characters to generate passwords
-s or --secure
Generate completely random passwords
-B or --ambiguous
Don't include ambiguous characters in the password
-h or --help
Print a help message
-H or --sha1=path/to/file[#seed]
Use sha1 hash of given file as a (not so) random generator
-C
Print the generated passwords in columns
-1
Don't print the generated passwords in columns
-v or --no-vowels
Do not use any vowels so as to avoid accidental nasty words
https://sourceforge.net/projects/pwgen/