Determine if filesystem or partition is mounted RO or RW via Bash Script?

Is there an easy way to determine if a mounted filesystem is mounted as Read-Only or Read-Write? I was thinking just to pipe mount but I thought there might be an easier way.

This little one-liner will pop-out something if a ro file system exists.

grep "[[:space:]]ro[[:space:],]" /proc/mounts 

Assuming you don't usually have a ro file system like a CD in the drive, it is sufficient for some basic monitoring type stuff and doesn't require changing the file system to find the current state. It also doesn't assume your file system type. Pipe it into grep -v iso9660 if you want to keep your CDs out of the record.

Old question, but I've came across it looking for same help and seems like found even easier way without the need to create file.

    [ -w /root-rw ] && echo "rw" || echo "ro"
    rw
    [ -w /root-ro ] && echo "rw" || echo "ro"
    ro

Of course, root-ro is ro mounted fs and root-rw is rw fs.

If the file system is mounted, I'd cd to a temporary directory and attempt to create a file. The return code will tell you if the file system is Read-Only or Read-Write provided that the file system is not full (thanks Willem).