Shell Programming and Scripting

Dear All,

I need an output file in a way as described below

the above data should be static i.e. will remain the same

and the second feild will print a value comming from another script as per time (please note script will be scheduled for 30 min interval in crontab, so it will run at specified time) and should print data corresponding to time and make a file, now the problem is when the script reruns after 30 min it writes a value but remove the histroy data wheras i want the history data also as mentioned below

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