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How to delete one line in a file in a loop?

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# 1  
Old 07-15-2009
Question How to delete one line in a file in a loop?
Hi there,
I am very new to UNIX,

I have problem. I have file in the following format.
20080101,1234
20080102,2345
20080103,3456
20090101,1245
20090102,1534
....
...

As part ot automating a process, i am suppose to read the first line and process the first cycle(20080101). Upon completion, the first line has to be deleted and then the process should start with the second cycle(the first line after deletion, 20080102).

Please, can some one help.
# 2  
Old 07-15-2009
This deletes first line of a file.

Code:
 
sed '1d' file  >tmp
mv tmp file

or 

sed -i '1d' file

# 3  
Old 07-15-2009
Thanks pal,
That was a good solution. I have a question for you though. How can i automate this? If the process completes the last cycle and sed command deletes the last entry, then will my process stop there or not?
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