file ... is writable


Return type:
True if the file exists and is writable, false otherwise.
file string-expression (is | isnt) writable


The file ... is writable test is used to determine if the system path named by the string expression is writable by the OmniMark program. This is useful to avoid a program error when writing out to a file. Using isnt instead of is will reverse the results.

This test will succeed if the named system path exists and is writable, or if the named system path does not exist, but can be created.

For example, the following program shows how file ... is writable is used to avoid attempting to write to a file that cannot be be written to:

     local stream errors 
     assert file "errors.txt" is writable
     open errors as file "errors.txt

Related Syntax