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Showing content from https://www.lispworks.com/documentation/lw80/lw/lw-hcl-78.htm below:

file-writable-p

file-writable-p Function Summary

Tests whether a file is writable.

Package

hcl

Signature

file-writable-p file => result

Arguments

A pathname, string or file-stream, designating a file.

Values Description

The function file-writable-p checks whether file is writable. Note that this checks the properties of the file, so trying to write to the file may still fail if the file is non-writable for other reasons, for example if it is opened for writing by another program.

Examples
CL-USER 44 > (file-writable-p  (sys:lispworks-file "private-patches/load.lisp"))
T

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