script to change value in file


 
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# 1  
script to change value in file

Hi,

I have a parameter file and it contains following items
$ cat TransactionParams
From_Date_Parm=2005-02-25
To_Date_Parm=2005-05-25
Extract_Root_Parm=/detld1/etl/ascential/Ascential/DataStage/Projects/CTI_London/IAM
Extract_Type_Parm=Transaction
EDW_Database_Parm=hdw_erks
EDW_User_Parm=t449206
FTP_Path_Parm=/detld1/etl/ascential/Ascential/DataStage/Projects/CTI_London/IAM/ftp/
FTP_User_Parm=t449207
FTP_Password_Parm=Magdog,123
Date_Run_Parm=06042005
Sequence_ID_Parm=1
Daily_Sequence_Parm=1
ParameterFileParm="nothing"
Send_FTP_Parm=Y


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.

cheers,
gops
# 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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