how to edit a file in a mounted file system in LINUX

I have a iso image in /exports/ under linux.
I mounted it to /exports/softImage/ using mount  -o loop  <iso file>   <target directory>.
Now in a subfolder under that target-directory i want to edit a file. When i try to save the file after editing it i get the error E212: Cant open file for writing
when i press df -ah to see how th efile system is configured:
/exports/myiso file        148M 148M    0 100%    /exports/softImage
pvinodpAsked:
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medveddConnect With a Mentor Commented:
The iso9660 filesystem is read-only. You will need to copy the files to another directory tree, make your changes and then burn a new image.
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pvinodpAuthor Commented:
If I try to change the permission of the file system [/exports/softimage] or the particular file i get this error Read only file system
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mwiercinCommented:
Remount the filesystem as read-write (it will affect your ISO though).

mount -o remount,rw /exports/softImage

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Then back read-only

mount -o remount,ro /exports/softImage

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farzanjCommented:
I tried the same thing a few months back.

You have to copy all the contents, edit the file you want and recreate the ISO again.

I didn't like this solution, but apparently this is the only way it can be done-- as I found after a lot of research.
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farzanjCommented:
Please checkout my question a few months ago
http://www.experts-exchange.com/OS/Linux/Q_26685553.html
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mccrackyConnect With a Mentor Commented:
You are wanting to edit an image of a CD.  If you edit it, the image will change.  So, you need to copy the contents, edit the file, and then use mkisofs to create the new ISO image.
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Duncan RoeSoftware DeveloperCommented:
You need to make a copy of the entire iso file system. Then make your changes. Then create a new iso image using mkisofs.
The following commands will make a copy of softimage in your home directory (you may want to put it elsewhere - adjust the below commands to suit)
mkdir ~/softimage_copy
cd /exports/softimage
tar -cf - . | tar -C ~/softimage_copy -xpUf -

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pvinodpAuthor Commented:
Thanks for the solution
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