i need to check if a cd is mounted or not using bash ... how is that possible?

the question is not clear.

If it is mounted it will show up in df output. If it is loaded but not mounted that would be more difficult to detect.

ok but you can access the cd only if its mounted right??? even if the cd is loaded

use
to check all mounted drives;

use

to check whether your CD ROM Drive has detected the disk.

No, if the CD is loaded then you could 'isoinfo -l dev=/dev/devicename 2>&1| grep -q Unable' and use the "$?" return value. But that wasn't really what you asked for in your OP. (More like 'grep -q cdrom /proc/mounts && echo something').

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The mount command is indeed the easier way to check, since you can use it (without arguments) as normal user. BTW if your system uses HAL to manage removable devices and if you really need to "constantly" check the cd status, the lshal command may be useful:
this will interface with the HAL daemon and it will report any changes to mounted device in real time. On the other hand parsing the output of the lshal command (without the -m option) can be useful in scripting, since it gives a lot of information about the drive and the mounted storage media.

thanx for replying

lshal -m works for monitoring . and i tried modifying the output of lshal using grep .but then i realised i need to make it more generic because i want this script to execute a file on the cd when it is mounted. i used df which shows the what all devices are mounted. here is the output when i use df with the cd mounted


Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda8 18073924 4906836 12248976 29% /
udev 642140 308 641832 1% /dev
none 642140 2632 639508 1% /dev/shm
none 642140 332 641808 1% /var/run
none 642140 0 642140 0% /var/lock
none 642140 0 642140 0% /lib/init/rw
/dev/sda6 39070048 37855272 1214776 97% /media/New Volume
/dev/sda5 1959898 1330254 629644 68% /media/New Volume_
/dev/sdb1 15752188 12568456 3183732 80% /media/ANURUPDT
/dev/sr0 715732 715732 0 100% /media/cdrom0

i tried the same thing on another system with the same cd but in that case instead of showing cdrom0 it showed the actual name i.e the volume label

if i could find some generic way to see if a cd is mounted or not that would be helpful
thanx in advance

How about hooking into whatever mechanism is mounting the CD -- maybe the udev system? It might be worth looking at the rules in /lib/udev/rules.d/ and /etc/udev/rules.d/