$ pwgen --capitalize --numerals --symbols --secure -1 20 10
+Whs7A9.BBOnxh,@^V(M
6B.D%NO!T%E]z{HgyG]e
jW{50wTpWAX&#W-|ms/p
r#!v4Cg4#+Wo{C[f5QWs
COf"31|Y]=N/4)h_7P`Q
i~A;O!mJm9:BBlS(KG0B
6FnO9"k#i<Ccj:y8[r&6
=J\:]aif`DKX1ZQ:Q{*#
VwC:2PcXv]nArOT|@esk
&xP=eY@C]DYI`{J3Z:X*
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/