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+Put this little script into you ~/.bashrc and you can run it from anywhere:
+<file>
+genpasswd() {
+	local l=$1
+       	[ "$l" == "" ] && l=20
+      	tr -dc A-Za-z0-9_ < /dev/urandom | head -c ${l} | xargs
+}
+</file>
+It takes one parameter which says how long a password you want:
+<code>
+tdd@s10e-tdd:~$ genpasswd 10
+ EpVrnblbz_
+tdd@s10e-tdd:~$
+</code>
+----
+Source: http://www.cyberciti.biz/tips/linux-unix-bsd-openssh-server-best-practices.html