How to check if path is on given disk?-CodePudding

I use lsblk -o MOUNTPOINT,PKNAME | grep '^/ ' | awk '{print $2}' to find root disk.

How can I check if path (/home/sun for example) is on disk found using previous command?

Thanks for helping out!

CodePudding user response：

The following will resolve symbolic link such as /dev/root, if present:

realpath $(df --output=source $DIR  |tail -n 1)

CodePudding user response：

You can get the disk of any file/path with df. for example:

df /home/sun will result point to the filesystem used for this path. We can use this in combination with your oneliner:

df /home/sun 2> /dev/null | grep $(lsblk -o MOUNTPOINT,PKNAME | grep '^/ ' | awk '{print $2}')

We then use /dev/null to remove all non existent directory errors.

CodePudding user response：

Try this :

#!/bin/bash

path="$(realpath "$1")"
awk '{ if (NR==FNR) {
          map[$1] = $2
       } else if ($NF in map) {
          print map[$NF]
       }
     }' <(lsblk -o MOUNTPOINT,PKNAME) <(df "$path")