Apr 5 2012

As a sysadmin, I need to generate lots of passwords and sometimes if you do so without an script the generated password becomes really easy to guess and also is hard to build a safe password.

Because of this I use this script to generate pseudo randomly passwords, is not an un-crackable method but solves the main problem.
You can put this code at the end of your .bashrc file, in order to make it like a system command, please do not remove the other lines in the file.

skyline ~ $ cd
skyline ~ $ vi .bashrc

##
##      By: Alvaro Soto - alvaro@headup.ws
##      http://headup.ws/node/18
##
##      genpasswd: Generate a pseudo random password
##                  using a given length (default = 20).
##

genpasswd() {
    local l=$1
        [ "$l" == "" ] && l=20
        tr -dc A-Z0-9_[%#?]a-z < /dev/urandom | head -c ${l} | xargs
}

##
##
##

skyline ~ $ . .bashrc
skyline ~ $ genpasswd 
vie8e4d5naTCH70XvDyT
skyline ~ $ genpasswd 10
ts0QtdPe_x
skyline ~ $ genpasswd 5
5nw5Q

Is a less secure option to pwgen but it doesn't need a compiler.

skyline ~ $ emerge pwgen -s
Searching...    
[ Results for search key : pwgen ]
[ Applications found : 1 ]

*  app-admin/pwgen
      Latest version available: 2.06-r1
      Latest version installed: 2.06-r1
      Size of files: 30 kB
      Homepage:      http://sourceforge.net/projects/pwgen/
      Description:   Password Generator
      License:       GPL-2

skyline ~ $ pwgen 20 --capitalize --symbols --numerals --secure  1
H2]}K/JGVs<523Xuv?"Y 
skyline ~ $ pwgen 10 --capitalize --symbols --numerals --secure 1
JZ7a*&|:RP 
skyline ~ $ pwgen 5 --capitalize --symbols --numerals --secure 1
`Aw8D 
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