ccd2iso won't overwrite any .iso file unless you tell it to with -f or --force. It uses a temporary file when reading the .img file, so even with -f your .iso won't get overwritten with an invalid ...

Convert Quantum Espresso VC-relax output to a CIF file. Process Quantum Espresso pw.x output file into a CIF file. Ported from perl script qe2cif.pl by Alexandr Fonari. Updated to read atomic ...