$ pwgen --capitalize --numerals --symbols --secure -1 20 10
JM"rkbY(tIc2UO[FhyvM
#dB!s{8z09ug5SC_Y7;u
^L\-p,@QJLg4LO_f,`zk
HyeKbu$Pdm})9`NPEv6T
ZbaleGu=wsL90p8Cjx<5
9big7gt'5j]HNNx?@.A$
]\KG[n7xJ`<jub&g_qDZ
V0/2\\kH&=>f3GmSx4[(
a/?<B3wC&pML798U]}9)
-}Z0`,!UbzC}/Bvrurzd
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/