$ pwgen --capitalize --numerals --symbols --secure -1 20 10
%;kvExH+;#'DTlmoX=38
urKOj:+:>gv\IJ5jPb+g
YczNS2rIvPVg13^Ac'&(
z,*{ClY[/lAfZ*%yT8/N
3Pv\}l<9)c@@=;$,EV[U
_mTYn,?G<+7%>Cm>7?Ks
A%.EMoR"WG)<B*lxqz9'
lx(:Tmd>v|a]z+7j7nmT
<3f%aB]\O&}\O{GPD12@
NJU`MN>i!umM0};:5auE
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/