Linux: Find Out What Partition a File Belongs To

by on December 19, 2011 · 4 comments· LAST UPDATED December 19, 2011

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How do I find out that /users/f/foo/file.txt file belongs to a specific partition? How do I find out on what partition a file exits?

The df command report file system disk space usage including file names and directory names. The syntax is as follows:

 
df
df /path/to/dir
df /path/to/file
 

In this example find out partition name for a file called /users/f/foo/file.txt, enter:
$ df -T /users/f/foo/file.txt
Sample outputs:

Filesystem    Type   1K-blocks      Used Available Use% Mounted on
/dev/sda5     ext4   472439072 146088944 302351616  33% /

The above command indicates that the file called "/users/f/foo/file.txt" belongs to /dev/sda5 partition. The following command only shows partition name:

 
df /users/f/foo/file.txt | awk '/^\/dev/ {print $1}'
 

OR

 
awk '/^\/dev/ {print $1}' <<<"$(df /users/f/foo/file.txt)"
 

Sample outputs:

/dev/sda5

I recommend that you place the following bash function in your ~/.bashrc file

 
# find partition name for a given filename
findpart() { [ -e "$1" ] && df -P "$1"  | awk '/^\/dev/ {print $1}' || echo "$1 not found"; }
 

Sample usage:
$ findpart /foo/bar
$ findpart /etc
$ findpart /home/vivek/test.txt

Sample session:

Linux df Command To Find Out On What Partition a File (Directory) Exits?

df Command To Find Out On What Partition a File (Directory) Exits

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{ 4 comments… read them below or add one }

1 ravinder singh February 7, 2012 at 3:22 pm

good site

Reply

2 Root October 4, 2012 at 9:48 pm

How do you change a partiton path? For example /dev/sda3 to /dev/sda4.

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3 Sam January 6, 2013 at 2:39 pm

Not every partition is in /dev (eg. encrypted directories).
You’d better use:

df -T /path |tail -n 1 |awk '{print $1}'

Reply

4 xyz0k October 28, 2013 at 5:33 pm

That was an useful tip. Thank you!! :)

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