[0xmohit]

> I use https://lastpass.com/ for generating passwords. ... Would prefer open source, but nothing else comes close.

On a linux/unix system, one could use /dev/urandom:

  tr -dc '[[:alnum:][:punct:]]' < /dev/urandom | head -16c

would generate a 16 character long password.

One could even put the following function in $HOME/.bash_profile or such

  genpw() {
    tr -dc '[[:alnum:][:punct:]]' < /dev/urandom | head -${1-16}c
  }

Now invoking it by saying genpw would generate a pseudorandom string of 16 characters length. You could specify the length by passing a parameter to it, e.g. genpw 8.

[EasyTiger_]

Are you implying this comes close to the convenience of LastPass?

[0xmohit]

Sorry, haven't used LastPass myself. But as far as generating a random password goes, this would be pretty effective.

[edent]

O...K... but where do you store them? How do you sync them between devices? How do you auto fill them in the browser? How do you change them when a service is compromised? How do you securely share them with other users?

LastPass does all of that. And I don't even have to drop into the terminal.

[kbaker]

pwgen already exists, working exactly like you were thinking.

    $ pwgen 16 1
    siaJa9fohnie9aew

Though, you should use lastpass or similar for many other reasons. Not just generating passwords, but for managing them.

[jrnichols]

Ubuntu has "apg" which I think does something similar.

https://help.ubuntu.com/community/StrongPasswords