$ pwgen --capitalize --numerals --symbols --secure -1 20 10
/SJP1tl3@J|;L`~:=RQo
*p1E&JmZ>IIzT4`_Q-1D
-UBR_I_UwrP\Rz7-endJ
A[?EHSJ^0Wp~Pz)r!(,%
'PXyt%B"d8ag*>dtx8,-
Fr(V>g0Fc?SS09N,J/ie
wwOtF3i#"DiYQAV(7JF$
[50g`0A"{$m/sMl^*TdM
WK^]N)bk%Up?4[q9!RL9
A#Wg$&_dsU(`tS7Dp>\6
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/