script to change value in file

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# 1  
script to change value in file


I have a parameter file and it contains following items
$ cat TransactionParams

What i should do is i need to write a script which should search for systemtime (based on the time we run) and if it is less than 12'0 clock from From_Date_Parm should be replaced with sysdate - 1 (2005-06-20) and To_Date_Parm as sysdate (2005-06-21) else if it is greater than 12 and less than 24 then From_Date_Parm = sysdate (2005-06-21)

How can i change the appropriate values using script.
I am new to unix and i want the code which does the corresponding job.

Thanks in advance.

# 2  
Quick & very dirty solution

I don't have time to write the code for you but you could do the following:

When updating...

grep the file for the original value,

generate new value...

pipe the file through sed and insert new value using s/// substitution.

This in no way counters the issue of file locking and temporary re-writes (i.e. output of sed overwriting original input). You can get away with it on small files but I wouldn't risk it in a professional system.

Alternatively, use Perl and the "profile" handler header that acts just like Get Private Profile in Windows API.

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