Linux / UNIX: Generate Passwords

by on May 27, 2009 · 1 comment· LAST UPDATED May 27, 2010

in

How do I generate random passwords under Linux / UNIX / Mac OS X and *BSD operating systems?

You can use the following command to generate the random password:

tr -dc A-Za-z0-9_ < /dev/urandom | head -c 16 | xargs

Sample outputs:

1z2G4SVmZOdd4uK4

You can create a bash shell function as follows (add to your ~/.bashrc):

 
genpasswd() {
	local l=$1
       	[ "$l" == "" ] && l=16
      	tr -dc A-Za-z0-9_ < /dev/urandom | head -c ${l} | xargs
}
 

Now use genpasswd as follows to create 8 character long password:
genpasswd 8
Sample outputs:

Es5Yzf8H

See also:

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{ 1 comment… read it below or add one }

1 turtle April 16, 2012 at 7:26 am

more elegant :

genpasswd() {
        tr -dc A-Za-z0-9_ < /dev/urandom | head -c ${1:-8} | xargs
}

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