$ pwgen --capitalize --numerals --symbols --secure -1 20 10
5.@5@~Mgt5":jM$@;aVU
DgWE\[)FJ113$fCQi=N]
T6[}!DX6*<VQ`rPBHnt/
yz}N*XlKh8Y6?5WSS>Jb
wvCh1m&c`D:3W08^Hc?+
FB}=m.$In5Mw^]0yks>J
#=K2UO[GaN=wF'v@|?v"
yA08]aMHC,-^?U8vq]m4
E[vgNs]:Rq{Km<Op+'^2
lgZ%/C6!/"ZOd_ph?2BG
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/