Linux - NewbieThis Linux forum is for members that are new to Linux.
Just starting out and have a question?
If it is not in the man pages or the how-to's this is the place!
Notices
Welcome to LinuxQuestions.org, a friendly and active Linux Community.
You are currently viewing LQ as a guest. By joining our community you will have the ability to post topics, receive our newsletter, use the advanced search, subscribe to threads and access many other special features. Registration is quick, simple and absolutely free. Join our community today!
Note that registered members see fewer ads, and ContentLink is completely disabled once you log in.
If you have any problems with the registration process or your account login, please contact us. If you need to reset your password, click here.
Having a problem logging in? Please visit this page to clear all LQ-related cookies.
Get a virtual cloud desktop with the Linux distro that you want in less than five minutes with Shells! With over 10 pre-installed distros to choose from, the worry-free installation life is here! Whether you are a digital nomad or just looking for flexibility, Shells can put your Linux machine on the device that you want to use.
Exclusive for LQ members, get up to 45% off per month. Click here for more info.
Should * be + instead since we NEED at least one for specifying the mode, not zero of [ugoa]?
Why? You don't need to provide any of [ugoa], "chmod +x file" is perfectly valid. According to the man page:
Quote:
A combination of the letters ugoa controls which users' access to the
file will be changed: the user who owns it (u), other users in the
file's group (g), other users not in the file's group (o), or all users
(a). If none of these are given, the effect is as if a were given, but
bits that are set in the umask are not affected.
So if you don't provide one, "a" is assumed.
Quote:
Originally Posted by fanoflq
Code:
([-+=]([rwxXst]*|[ugo]))+ where + means 1 or more of the outer parenthesis, (....).
Here the author indicates the parenthesis before the + can be repeated and at least one must exists,thus contradicting the asterisk in [ugoa]*.
How is that a contradiction? You don't need to provide [ugoa], but you do need to provide a permission modification, otherwise what's the point in running chmod?
Last edited by suicidaleggroll; 07-21-2016 at 11:10 AM.
As usual, a great deal of your questions would be answered by simply reading the man pages instead of asking so many questions about them. You can trust that tried and tested commands, such as chmod,
would be extremely unlikely to give you invalid information. So this being the case, the answer will often be in the detailed writing of the man page in question.
LinuxQuestions.org is looking for people interested in writing
Editorials, Articles, Reviews, and more. If you'd like to contribute
content, let us know.