To modify the size of a tmpfs filesystem, you can use the `mount` command with the `-o` (mount options) flag to specify the new size you want to allocate to the system.

Here are the steps to follow:

1. Unmount the tmpfs filesystem using the `umount` command. For instance, if your tmpfs filesystem is mounted at `/mnt/tmpfs`, enter the following command: 

```
umount /mnt/tmpfs
```

2. Remount the tmpfs filesystem with the new size using the `mount` command. The syntax for the `mount` command is as follows:

```
mount -t tmpfs -o size=SIZE,mode=MODE /mount/point
```

Replace `SIZE` with the new size you want to allocate in bytes, or use a shorthand suffix (e.g., M for Megabytes, G for Gigabytes). Replace `MODE` with the permissions you want to set for the new file system, for example `1777` to set `u+rwx`, `go+wt`. Finally, replace `/mount/point` with the mount point of your tmpfs filesystem.

For example, if you want to allocate 2GB of memory to your tmpfs filesystem mounted at `/mnt/tmpfs`, you would use the following command:

```
mount -t tmpfs -o size=2G,mode=1777 /mnt/tmpfs
```

3. Verify that the new size was successfully allocated by using the `df -h` command to list all mounted filesystems, including the size of the tmpfs filesystem at `/mnt/tmpfs`.

```
df -h
```

That's it! By following these steps, you should now have successfully modified the size of your tmpfs filesystem.
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