hi
i have an file with read only file system an i want to delete it
but when i remove it the "Readonly file system" Error appear how can chang the file system of file

What is the output of the command line command?:

mount

You need to (re-)mount the file system read/write. From the command line, either of:

sudo mount -oremount,rw MOUNTPOINT
sudo mount -oremount,rw DEVICE

Change MOUNTPOINT or DEVICE to the file system mount point or device that shows up in the output of your mount command.

i have a flash memory(cooldisk) in this flash is a virus and everything i copy in it then i cant remove it.
when i want to remove with rm command this Error appear
rm:cannot remove "lyu.exe" is Read-Only File System

please tell me how can change my cooldisk filesystem

What is the filesystem type?

Use the file command to find out. For example, if the partition is /dev/sde1, then enter "sudo file -s /dev/sde1".

Also, do as suggested and post the output of the "mount" command with no arguments.

If this is one of those active usb devices that has a cdrom emulated section, then you may need to resort to google to find the answer. The iso9660 filesystem is read only. You may need to copy the image to a directory, and create a new iso image without the virus and reflash the drive. I have no idea how you would do the latter part. You may need to call the manufacturer in that case if using google doesn't provide an answer.

( If an iso9660 filesystem is on a partition of a parent device, e.g. /dev/sde containing /dev/sde1, and the parent is writable, then you may be able to replace the image on /dev/sde1 even if the raw /dev/sde1 device isn't writable. You could do this using losetup to setup a loop device on /dev/sde with an offset where /dev/sde1 starts and then writing to this loop device using dd to copy a modified iso image. The new image will need to be the same size or smaller to keep from overwriting the start of /dev/sde2. )

See the man pages for mount, file, losetup & dd.
And provide more information on this device, how the partitions are mounted, etc.

hoshangi, it is difficult to help people when insufficient information is presented. If you want help, please provide as much information relevant to the problem as you are able.

Not much to do with programming, moving to Linux - General.