:sig
bool file_put_contents(String file_name, String content)

:params
file_name : file to write, resolved against the unit's directory
content : bytes to write (replaces any existing content)
return value : true on success

:content
Writes `content` to a file, replacing whatever was there. The write takes an exclusive lock for the truncate-and-write, so concurrent writers are serialized and readers wait for it; you never manage locks yourself.

:example
file_put_contents("/tmp/doc-put.txt", "first");
file_put_contents("/tmp/doc-put.txt", "second");
print(file_get_contents("/tmp/doc-put.txt"), "\n");

:see
>sys
file_get_contents
file_append
file_open