sed is extremely helpful in search & replace text, in file & variables. Often we need to construct a list of strings together with variables. But the normal usage of sed :e.g. sed -e ’s/text-to-search/string-to-replace-$variable-name/g’ will only replace the variable $variable-name literally rather then the pre-define value. After meddling with a few more …

The Nokia E71 & E63 is a versatile phone for people that needs the business suite of application, e.g. email, messenger, documents & spreadsheet, camera and most importantly, the symbian platform. The symbian platform is widely used on mobile phones. Symbian’s platform also have a wide variety of applications.For *NIX system administration, shell access to ...

The mutt is not just an email client, it is also very useful in bash script. mutt’s CLI (command line interface) parameter can be called and execute without starting the email client interactively, ideal to run it within bash script to send email. mutt is also able to control from config file, ~/.muttrc, with a ...

Epoch dates are seconds started from 1st January, 1970. It is a common date and time representation, especially in unix and linux world. It provides a way to convert time stamp in a much easier way for programming calculation, an integer. Below are one of the way to convert epoch timestamps to a readable format ...

Recently, there has been a few incident on vulnerabilities of DNS server being exploited. Fortunately, Bind have release patches soon enough for the rest of us to start covering up the loop holes.After an upgrade or installations of ISC Bind DNS server 9.6 on a FreeBSD box, we will need to stop and start “named” ...

A short tip. For searching in vim, enter the “Command-line” mode by type a colon (”:”) in “Normal” mode (Esc twice at any time) and type “set ignorecase” for case-insensitive search.e.g.:set ignorecaseAdditionally, for “next” occurrence or match, type “n” or “N” for “previous” …

Printing variables or text within bash script is good for debugging. It can trace which line or variables is having problem. echo is the commonly is used for such debugging purpose. But some times we need it to print tabs, new line & other escape strings in a one liner bash. One way to do ...

Commonly, changing network interface IP, subnet mask or DNS used to be on GUI (Graphical User Interface). But they will be times it needs to be done on CLI (Command Line Interface). e.g. the windows manager fail to start, window manager does not provide a GUI to change it, it is a server and ...

Another reason to use open source software. If you have just got yourself a Dell laptop and want to monitor the system fan, temperature, processor speed & other stuff, you’re in luck. The open source community have come out with a piece of excellent utility to do the job. Better, the utility is able ...

Previously, we have talk about how to assigh dynamic IP to an interface on Freebsd. This post is about how to assign fixed or static IP to an interface on Freebsd. Below are the steps :Manually assign fixed IP :1. ifconfig bce0 inet <IP address> netmask <subnet mask>2. route add default <gateway IP address>3. /etc/netstarte.g.ifconfig ...