having a good idea of what file permissions are in unix is must for anyone who wants to work in Unix or Linux operating system. Unix provides tight control over who can access the file and various read, write and execute permission. directories are also protected by permissions and you can only go inside a directory in unix if you have execute permission on that directory. default file permission can be controlled by umask. overall this article gives you lot of important stuff about file and directory permissions in Unix.
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Tech : What is File permissions in UNIX with Example
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