$ pwgen --capitalize --numerals --symbols --secure -1 20 10
jTJ?A1BD&tu^Q"=JdA0_
>8`_V7<M=-o#sTf>Jul-
p)"rMQS4x[ToX\?.E()@
*b~2$ZD,,]@.6%&#!sKS
KOJ9N?5<9!kZ#D=SZ4Eu
<zjR<+c@_"SZX=\>o0r>
+dW}_"2~yQ9G]?;Leu\"
^#0~yE_?T,yoK_^Ri"^L
rePl12n}210L-8%(PsQg
+>,jjx$U~--(9Y'^Qg=*
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/