operator
true if the system path named by string-expression 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
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.
The following program shows how file ... is writable is used to avoid attempting to write
to a file that cannot be be written to:
process local stream errors do unless file "errors.txt" is writable put #log "ERROR: %"errors.txt%" is not writable.%n" halt with 1 done open errors as file "errors.txt"