I recenty found this advice given by Randal Schwartz. I think most of programmers got some idea who he is. Anyway if you have not had to touch Perl here is the link to wiki page.

Here is the advice from Randal:

How to do it ? It’s actually very simple. You can achieve this by unset HISTFILE. Of course in such case we only disable history for current session. What if we want to selectively do not put some commands into bash history ?

Sometimes there is a need to add timestamp to bash history. At my work I found it quite useful especially when some other developers got access to the same box or when you simple want to have an idea when command from history was executed.   This is how we can achieve this:

echo 'export HISTTIMEFORMAT="%d.%m.%y %T"' >> ~/.profile

(or .bash_profile if you use RHEL based distro) and after that just re-login or reload your profile file. Time formatting is exactly the same like for strftime please check man 3 strftime.

Hint: reloading profile can be done like this: . .profile or source .profile

–
Cheers
Robert

After set up of the “linode” on linode.com I stared configuring the firewall (iptables). After writing down all my rules and tried to restart iptables but output like this:

$ service iptables restart
iptables: Flushing firewall rules:                         [  OK  ]
iptables: Setting chains to policy ACCEPT: security raw nat[FAILED]filter
iptables: Unloading modules:                               [  OK  ]
iptables: Applying firewall rules:                         [  OK  ]

I recently noticed I actually spend a lot of money to hosting and server resources Im not using at all. Such a waste. After a small research I decided to move all my Droplets from DigitalOcean.com to its competitor > linode.com . I also hosted 2 sites on a separate hosting - elastichost.com which is also rather expensive. So at the end I sit down and calculated how much resources do I need and for how many resources I actually pay. At the begining I tought that maybe the best solution would be to move everything to dedicated machine at OVH or maybe Hetzner but in both cases this is a cost ~50-70€ per month min. Quite much I think especially when my sites do not have significant traffic.