`writelines`

Writes text lines to a file, one string per line.

Category: Data Import and Analysis > Data Import and Export

Syntax

writelines(str, filename)

Writes each element of the string array str as a line of filename.

writelines(str, filename, 'WriteMode', 'append')

Adds the lines at the end of an existing file instead of replacing it.

Description

writelines is the plain-text counterpart of readlines. Each element of str ends with a line break, and the text is stored as given, so nothing is quoted or converted. It is the simplest way to save logs, notes or generated code.

Escape sequences inside a quoted literal are not interpreted: 'a\tb' is written with a backslash and a t. Build the text with sprintf when you need real tabs or other control characters.

Input arguments

str: String array, character vector or cell array of text.
filename: Output file name.
'WriteMode': 'overwrite' (default) or 'append'.

Example

Write, then append

writelines(["first"; "second"], 'lines_demo.txt');
writelines("third", 'lines_demo.txt', 'WriteMode', 'append');
type lines_demo.txt

Output


first
second
third

writelines