Insert row into empty file...how?


 
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# 1  
Old 12-12-2013
Insert row into empty file...how?

Greetings:

I generate an empty flat file just fine when there's no data returned from my process, as the customer wants one always (using the 1st line of the below script). However, they also want at least the column names in this flat file (row 1, the only row to be in the emply file). I'm attempting to use the sed "i" for inserting a new row with 3 column names in a single text string.

I'm not sure of the syntax for inserting a new row into an already empty file; it is even possible?

Thanks for any advice & guidance.

Code:
touch /TgtFiles/Test_File.csv;
sed ' i\ TransDate,Amount,AuthorizationNumber' /TgtFiles/Test_File.csv


Last edited by bartus11; 12-12-2013 at 03:43 PM.. Reason: Please use code tags
# 2  
Old 12-12-2013
You can simply "echo" the line you want to have there:
Code:
echo "TransDate,Amount,AuthorizationNumber" >> /TgtFiles/Test_File.csv

This User Gave Thanks to bartus11 For This Post:
# 3  
Old 12-12-2013
bartus11:

Yes, your solution worked fine...thank you so much. (I'll use tags around script in any future posts).
# 4  
Old 12-12-2013
Also I would suggest to check if the file is empty. If yes, then write to it:
Code:
#!/bin/ksh

[ ! -s /TgtFiles/Test_File.csv ] && print "TransDate,Amount,AuthorizationNumber" > /TgtFiles/Test_File.csv

# 5  
Old 12-12-2013
Ok Yoda, that is a good idea but then is your script above inplace of using the echo command?
# 6  
Old 12-12-2013
You can use echo instead.
This User Gave Thanks to Yoda For This Post:
# 7  
Old 12-12-2013
Yoda, good solution you provide. My universe is again in balance. Smilie

Last edited by Benrosa; 12-12-2013 at 07:00 PM.. Reason: Added more text.
 
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