I am trying to create a shell script that does the following

1. Checks if a block device has a file system on it.
2. Mount filesystem

I have something like this right now

ls -ltrh /dev/vdb
brw-rw---- 1 root disk 254, 16 Dec 15 21:09 /dev/vdb

So /dev/vdb is my block device

  And my script is something along the lines of

if TEST-COMMAND-TO-CHECK-IF-VDB-ALREADY-HAS-FILESYSTEM-FORMATTED
   then
     sudo mkfs.ext4 /dev/vdb
   fi 
fi

mount | grep /mntpoint > /dev/null && exit 0 || sudo mount /dev/vdb /mntpoint

I am trying to find out a good command for TEST-COMMAND-TO-CHECK-IF-VDB-ALREADY-HAS-FILESYSTEM-FORMATTED

I am trying to create a shell script that does the following

1. Checks if a block device has a file system on it.
2. Mount filesystem.

I have something like this right now

ls -ltrh /dev/vdb
brw-rw---- 1 root disk 254, 16 Dec 15 21:09 /dev/vdb

So /dev/vdb is my block device. And my script is something along the lines of

if TEST-COMMAND-TO-CHECK-IF-VDB-ALREADY-HAS-FILESYSTEM-FORMATTED
   then
     sudo mkfs.ext4 /dev/vdb
   fi 
fi

mount | grep /mntpoint > /dev/null && exit 0 || sudo mount /dev/vdb /mntpoint

I am trying to find out a good command for testing if dev/vdb has filesystem formatted.