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Create a continuous digital clock in Linux terminal
Source: http://www.my-guides.net/en/guides/linux/364-how-to-create-a-continuous-digital-clock-in-linux-terminal

Fetch the Gateway Ip Address
This is to fetch the Gateway Ip Address of a machine. Use the below format to put the value in a variable if you wish to find the gateway ip in a script $GATEWAY=$(netstat -nr | awk 'BEGIN {while ($3!="0.0.0.0") getline; print $2}')

Monitor RAID IO Usage
Shows the IO of the raid sync

Create a mirror of a local folder, on a remote server
Create a exact mirror of the local folder "/root/files", on remote server 'remote_server' using SSH command (listening on port 22) (all files & folders on destination server/folder will be deleted)

command shell generate random strong password
shell generate random strong password

Backup a file with a date-time stamp
$ buf myfile.txt This is useful when you are making small but frequent changes to a file. It keeps things organised and clear for another administrator to see what changed and at what time. An overview of changes can be deduced using a simple: $ ls -ltr

Calculate pi to an arbitrary number of decimal places

Reboot as a different OS in Grub
This will reboot as the Grub 2 option.

List .log files open by a pid
Uses lsof to display the full path of ".log" files opened by a specified PID.

Poor man's ntpdate
If you don't have netcat, you can use curl.


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