how to check the conditions for mount point if already mounted or unmounted?help!!

noahshines · 10-16-2015, 04:23 PM

#!/bin/bash
i="/rtlogs";

mount $i 2>&1

if [ $? -eq 0 ] ; then

echo "Mounted successfully"
else
echo "Unmounted successfully"
fi
------------------------------------------------------
#!/bin/bash
i="/rtlogs"
umount $i 2>&1
if [ $? -eq 0 ] ; then
echo " $i Unmounted successfully"
else
echo "$i DID NOT UNMOUNT SUCCESSFULLY"
lsof $i
fuser $i
fi
---------------------------------------------------------------

because the script runs fine ONCE. if I re-run the script more than once...i need it tell the user that "Already Mounted " OR "Already Unmounted"

Didier Spaier · 10-16-2015, 04:43 PM

Before mounting or unmounting, grep the output of "cat /proc/mount" or "df -h" to see if your device or mountpoint is already mounted or in use.

Perceptor · 10-16-2015, 04:59 PM

You have posted two scripts.
I am not sure if this is what you want, but this is how I'd do it:

Code:

#!/bin/bash
if [[ -n `mount | grep rtlogs` ]]; then
echo "mounted"
        if [[ $1 == "act" ]]; then
                echo insert_your_umount_command_and_remove_this_echo || echo "Failed to unmount!!!"
        fi
exit 0

else
echo "not mounted"
        if [[ $1 == "act" ]]; then
                echo insert_your_mount_command_and_remove_this_echo || echo "Failed to mount!!!"
        fi

fi

If called without parameters, this script will only show you the mount status. If called with the act parameter, it would be able to (u)mount as well.

noahshines · 10-19-2015, 09:52 AM

@Perceptor Could you please explain what an "act" parameter is?

Perceptor · 10-19-2015, 02:33 PM

It refers to calling the script like this:

Code:

/home/user/script act

as opposed to without arguments.
$1 refers to the first "option" of the script. In this case we're checking for a particular string (the string act is completely arbitrary).

michaelk · 10-19-2015, 02:50 PM

FYI because the output of `mount | grep rtlogs` is a string that basically consists of "/dev/sda1 on / type ext4 (rw)" the if -e conditional does not work as expected.

As Didier Spaier posted you need to check the status prior to running the mount or unmount command. There are many ways to accomplish the task and your distribution might include the mountpoint command or maybe possible to install it from the repository.

Code:

#!/bin/bash    
if mountpoint -q "/rtlogs"; then
    echo "/rtlogs is mounted"
else
    echo "/rtlogs is not a mounted"
fi

Also as suggested to check if the rtlogs is mounted using /proc/mount you can swap the if statement above for

Code:

if grep -qs "/rtlogs" /proc/mounts; then

Didier Spaier · 10-19-2015, 03:13 PM

Thanks michaelk I didn't know the mountpoint command. I confirm that it is shipped in Slackware in the util-syslinux package.

PS I realize now that I don't know what distribution the OP is running... Still "which mountpoint" or "whereis mountpoint" should tell if it's installed and where.

chrism01 · 10-19-2015, 09:04 PM

Thanks from me also: haven't seen 'mountpoint' before.
Just for anyone else, I can confirm it exists in Centos6 (& therefore RHEL6 I assume)