First, ensure that mkisofs is installed on your system. You can do this by running sudo yum install mkisofs on CentOS or sudo apt install genisoimage on Ubuntu, as mkisofs is part of the genisoimage package.
To modify the contents of an ISO file, mount it using the command: sudo mount -o loop yourfile.iso /mnt. This allows you to access the files within the ISO for editing.
Create a directory to work with and copy the mounted ISO contents into it. Use mkdir ~/iso-edit and cp -r /mnt/* ~/iso-edit/ to copy all files for easy access.
Navigate to your working directory and make any desired modifications. This could involve adding, deleting, or editing files, such as configuration files or documents.
Once you've made your changes, you can re-pack the ISO file with the command: mkisofs -o newfile.iso -J -R ~/iso-edit/. The -J option enables Joliet extensions for Windows compatibility, and -R allows for Rock Ridge extensions.
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