How can I tell if a file is on a remote filesystem with Perl?

Question

Is there a quick-and-dirty way to tell programmatically, in shell script or in Perl, whether a path is located on a remote filesystem (nfs or the like) or a local one? Or is the only way to do this to parse /etc/fstab and check the filesystem type?

Answer 1

stat -f -c %T <filename> should do what you want. You might also want -l

Answer 2

您可以使用“df -T”获取目录的文件系统类型，或使用-t选项将报告限制为特定类型（如nfs），如果它返回“没有处理文件系统”，那么它不是一个你要找的那些。

df -T $dir | tail -1 | awk '{print $2;}'

Answer 3

If you use df on a directory to get info only of the device it resides in, eg for the current directory:

df .

Then, you can just parse the output, eg

df . | tail -1 | awk '{print $1}'

to get the device name.

Answer 4

I have tested the following on solaris7,8,9 & 10 and it seems to be reliable

/bin/df -g <filename> | tail -2 | head -1 | awk '{print $1}'

Should give you have the fs type rather than trying to match for a "host:path" in your mount point.

Answer 5

On some systems, the device number is negative for NFS files. Thus,

print "remote" if (stat($filename))[0] < 0