Fortran overwrite existing file

I use Crimson Editor as a text editor that does not lock a file, so my code can overwrite it while it's open in Crimson. I cut-and-paste updated data from the text editorinto the table in Manifold once cleared.

Then refresh the drawing. This approach got a few extra steps in it, but I find it still faster than re-linking the csv file every time, or close and reopen Manifold, so it will release the csv file for overwrtiting. How do you write your CSV files in Fortran though? I'm having a hard time figuring that out. For more complete information about compiler optimizations, see our Optimization Notice. WRITE to an existing file that another program has linked to - possible?

One of my programs outputs a file in. After the file has been opened, it is accessed by read and write statements. Once done, it should be closed using the close statement. When the above code is compiled and executed, it creates the file data1. And then closes the file. The read and write statements respectively are used for reading from and writing into a file respectively. Collectives on Stack Overflow. Learn more. Asked 5 years, 6 months ago. Active 5 years, 6 months ago.

Viewed 9k times. I want to do it in the following manner: 1 open the file and write the first line with some text say, " Hello " 2 Write rows in the file as desired and keep a counter for number of rows. The problem is in step 3. I don't know how to replace the first line. Archak Mittal Archak Mittal 65 2 2 silver badges 7 7 bronze badges.

Add a comment. Active Oldest Votes. Stream access is likely what you want. Examples for both approaches are shown below. The fixed record length. No need to write records in order - we just leave off! All the "data" records are offset by one, to allow the! Now update the first record with the number of following "lines". Another option that I can think of is to write to 2 files. First, write a file as above without the counter.

Once the run is over, close the file and write another file and this time, I know the value of the counter. I believe there is a way to proceed with the first approach. Can someone please help me with this? With direct access, all the records in the file are the same length. Note though, that the typical disk format of a direct access file may not match your idea of a file with "lines".

The typical disk format of a formatted stream access file usually matches with what people expect of a text file with lines. Going back on a sequential access file is tricky, because lines can vary in length. And if you change the length of one line, you'd have to move all the stuff behind. What I recommend is to write your output to a scratch file while counting the number of lines.

Then, once you're finished, rewind the scratch file, write the number of lines to your output file, and copy the contents of the scratch file to that output file.

Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Asked 5 years, 6 months ago.