insert a line into the beginning of a file without overwriting data

[jjs7419]

I would like to dynamically alter/add new headers to a csv file as needed. The code I have below overwrites the previously written data an amount equal to each new header added each time I call the vi below. Any suggestions on how to do this without reading in the file each time? I want to avoid the processing time of reading in the file between processing new data.

Thanks!

[nyc_(is_out_of_here)]

The simple answer is No.

You need to read the entire file to pre-pend that line.

If you were actually working with true Excel files, you can.

[jjs7419]

Thanks! That's what I thought.

[Yamaeda]

If you're gonna change the file several time during a run you can ofc. keep the data/file in memory and modify that instead.

/Y

[jjs7419]

The problem with that is for days of testing you might loose data if something goes wrong.

[Yamaeda]

Yes, but you can still write everytime, you dont need to read the file back. 🙂

/Y