$ pwgen --capitalize --numerals --symbols --secure -1 20 10
{Y6)v9n_w.Ur>8TGg.(N
:YI1B|GgBHIJs_}`yK.4
R[8X3U8AT<jH!6('b2xV
*7rN/XEvi&DSJr"fcC2<
*+R,[[/?|Vueyo|+6mW#
IMP5ZL86IxUDHEq}}yJ.
pTJ"3`Q2uT!uy"HDZ{g7
O(OB\U[Z_E@QZ46?Z6g:
,yjL~<8W-B7n_GW~!2.-
3W1}5.7N>G'>1WVeqR^'
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/