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Closed 9 years ago.
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I am using Cent-OS and I am trying to copy a file. I su to root first, then I execute:
cp test.txt /usr/java/jdk1.7.0_45/jre/lib/management
But I get an input/output error. Why can't I copy this file as root? Is there something that can lock a folder in Linux so root can't change it?
root is a concept to get around the system's permissions.
IO error is a more physical problem that could be of a much more varied nature. Common examples included faulty media, unreadable CDs, lost connection, and so on.
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Closed 2 years ago.
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I read that "1" is the number of hard links to the specific file, but what exactly are hard links?
In computing, a hard link is a directory entry that associates a name
with a file on a file system. All directory-based file systems must
have at least one hard link giving the original name for each file.
The term “hard link” is usually only used in file systems that allow
more than one hard link for the same file.
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Closed 2 years ago.
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I've learned that linux directory is a file. So can I view it in binary mod like viewing other files with hexdump?
You can dump raw portions of a drive using the dd command and that is about as low level as you can get. You can also use debugfs to do maintenance on the filesystem.
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Closed 6 years ago.
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I am making a folder where there are some shared files which can be read and written by anyone (but not executable) in a server. But I don't know what kind of owner and group are used for the files. Are there any special or well known owner or group for the purpose? Thank you very much.
The best approach to do this would be to use:
chmod 110
This will change file permission to read & write, no execute
linuxcommand.org/lts0070
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Closed 6 years ago.
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How I can find out how much /tmp space is required by an application. Generally sometime I see /tmp is full and get error saying not able to write to /tmp. So is there any way to find out how much /tmp space is required by an application ?
There is no way. Programs use /tmp on an ad-hoc basis.
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Closed 7 years ago.
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I want to know the purpose of each folder in the root directory of linux/mac, like /var, /etc, /usr, /opt, etc. Can anybody shed some light?
Read the File Hierarchy Standard (at least for Linux). See also this and the Linux standard base.