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How do I test if a file has write permission?

by ChuckularOne (Parson)
on Apr 20, 2000 at 22:04 UTC ( #8224=categorized question: print w/replies, xml ) Need Help??
Contributed by ChuckularOne on Apr 20, 2000 at 22:04 UTC
Q&A  > files


The -w test will do:
if (-w FILEHANDLE) { print "It's writeable by my effective uid or gid!\n"; }
This code was credited to chromatic by the author. --Ed.

Answer: How do I test if a file has write permission?
contributed by fx

Another, but probably less efficient way, is to open the file in append mode. If the open fails the file COULD be read-only:

open(FILE, ">>some_file.txt") || print "File is read only";

The advantage of this way, I suppose, is that if you really want to write things to the end of the file then it's now open :)

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