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Closed 2 years ago.
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Hard links cannot span physical devices. Exactly this statement I read while understanding the concept of hard link in Linux. Can anyone help me to understand this ?
A filename, is a pointer to an inode.
So if you're not on the same drive, it's impossible to link a file, because the inodes belongs to a specific disk
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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 found something on my linux systems i don't understand.
The files /var/spool/mail/root and /var/mail/root point to the same inode but the link count is 1. This is the same on a ubuntu and a centos server.
When i create hardlinks to a file the hardlink count increases with every new file.
Why is the link count just one?
That is because /var/mail is a symbolic link to /var/spool/mail.
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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.
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Closed 9 years ago.
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I would like to have more clarification on the functionality of sync(8) and fsync functions in Linux (2.6.31). Does it make sure the files are written to the respective storage?
http://linux.die.net/man/8/sync
It does not make sure that files are written to respective storage. It only makes sure that cached/buffered data is flushed to the disk device. It doesn't matter if this is an SD Card or whatever.