Question

I have an applescript that reads data from a CSV (successfully!). After my script is done editing the data, I want it to write the modified text back to that file.
When my text is written back to the CSV file it has lost all of its carriage returns, so it reads as one line. What am I doing wrong?

set theFile to choose file with prompt "Select a text file:"
set theFileContents to read theFile
...


set theList to paragraphs of theFileContents



repeat with i from 2 to count theList

set AppleScript's text item delimiters to ","
set theLine to theList's item i
theLine
set clinic_id to first text item of theLine
....
set AppleScript's text item delimiters to ""

...

    open for access theFile with write permission

    set theData to theList as text
    write the [theData] to theFile as text
    close access theFile


    display dialog the [theLine]
end if
end repeat

Any suggestions? The output of this code is:

1,2,3,A,B,C,X,Y,Z

when what I want is

1,2,3
A,B,C
X,Y,Z

Answer 1

I suppose your theList has lines (each line a string with commas) as its items, so it looks like {"1,2,3", "A,B,C", "X,Y,Z"}, right? So, before converting the list to a text in order to write it to the file, set the text item delimiters to the newline character:

set AppleScript's text item delimiters to "\n"
set theData to {"1,2,3", "A,B,C", "X,Y,Z"} as text

theData has now the value

"1,2,3
A,B,C
X,Y,Z"

which is exactly what you’ll find in the output file.