Indeed, some people are surprised: if I’m the owner of a given file, why can’t I change the ownership for it? That’s because transferring the ownership will mean some other Unix user will become the owner of the file(s) in question. Any regular Unix user cannot change the ownership of any file, and I’d like to explain why. It is important to realize that you can only change file ownership as a super-user (root). In my example, the only file we’d like to change ownership for is file1. In this command, nobody is the username of the new owner for a list of files. To change the owner of a file, you need to use the chown command (easy enough to remember: CHange OWNer – chown), with the following syntax: ubuntu$ chown nobody file1 When you’re changing the owner of a file, no data contained in a file is changed. Changing owner of a file in UnixĬhanging file ownership means only updating the association between a Unix user and a file, and nothing else. The next field is a Unix group of each file’s owner – admin in my example. rw-r-r- 1 greys admin 0 Feb 9 03:55 file2Īs you can see from this listing, the owner (third field in each line) is my username – greys. rw-r-r- 1 greys admin 0 Feb 9 03:54 file1
Here’s a setup for today: I have created a temporary directory with a few files and made myself the owner of all the files: ubuntu$ ls -al /home/greys/example/ĭrwxr-xr-x 3 greys admin 4096 Feb 9 03:55.
#How to search multiple files in unix how to#
I’ve briefly touched the topic of confirming file ownership in Unix before, so today I will simply build on that and show you how to change ownership of files. There simply isn’t a way to create a file without assigning ownership. Just to give you a quick reminder, I’d like to confirm that every single file in Unix belongs to some user and some group. I also have articles on searching Linux text files with find and grep, and an article on how to grep multiple patterns, which uses a similar approach to this article to search for multiple text patterns.I’ve just been asked a question about changing the ownership of files from one Unix user to another, and thought it probably makes sense to have a quick post on it. If you're looking for other uses of the find command, check out my Linux find command examples page. I hope these examples of how to use the Linux find command to find multiple filenames (filename extensions) with one command has been helpful. Linux find multiple filename extensions - Summary Those find command options aren't always necessary, so I thought I should mention them.
I just tested this on a MacOS system, and it worked fine.įWIW, note that in these examples I keep using ".", which means "look in the current directory, and anywhere beneath here", and "-f", which means "only look for files, not directories". type f \( -name "*cache" -o -name "*xml" -o -name "*html" \) To help you see how to expand this from finding two filename patterns to finding even more filename patterns with one find command, here's an example of how to search for three different files extensions with one find command:įind. Linux find multiple filenames command: finding three filename extensions I've tested this 'find multiple' command on several Unix systems, and it should work on all systems that support the Bash shell, including vanilla Unix, Linux, BSD, freeBSD, AIX, Solaris, and Cygwin. If you’re familiar with common Linux find commands, the only magic here is (a) using the "-o" option to say "or", and (b) escaping the parentheses with the backslash character.
Here's a Linux find command that shows how to find multiple filenames at one time, in this case all files beneath the current directory ending with the filename extensions ".class" and ".sh":įind. Linux find multiple filenames command - two filename patterns In short, the solution is to use the find command's "or" option, with a little shell escape magic. You can use the Linux find command to find multiple filename patterns at one time, but for most of us the syntax isn't very common. Unix/Linux find command FAQ: How can I write one Unix find command to find multiple filenames (or filename patterns)? For example, I want to find all the files beneath the current directory that end with the file extensions ".class" and ".sh".
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