$ pwgen --capitalize --numerals --symbols --secure -1 20 10
D*):YtbdK@I8[{9?Y.R!
,hN8o9I90G[GB`WBkjyM
vd:eyRXH8eMN?5rB7*(8
]nGDn"DC%C?Q~g*mv*9$
7*&y/IKHO}5**Me;a<RI
S.rx0q)i;W^>Wf#MuBx3
o_Q,c9K'*Pu%C]RfPbkK
3W0ws;0C[Wet)PEQ&%t{
tkX<s0uD2g-9K@{v^tX:
g!Y.Pe,0xbT}od9:q8~\
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/