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The following commands are supported: 

` create [-e] [-b base_image] [-f fmt] filename [size]' 
` commit [-f fmt] filename' 
` convert [-c] [-e] [-f fmt] filename [-O output_fmt] output_filename' 
` info [-f fmt] filename' 
Command parameters: 
filename 
is a disk image filename 
base_image
is the read-only disk image which is used as base for a copy on write image; the copy on write image only stores the modified data 
fmt 
is the disk image format. It is guessed automatically in most cases. The following formats are supported: 
raw 
Raw disk image format (default). This format has the advantage of being simple and easily exportable to all other emulators. If your file system supports holes (for example in ext2 or ext3 on Linux), then only the written sectors will reserve space. Use qemu-img info to know the real size used by the image or ls -ls on Unix/Linux. 
qcow 
QEMU image format, the most versatile format. Use it to have smaller images (useful if your filesystem does not supports holes, for example on Windows), optional AES encryption and zlib based compression. 
cow 
User Mode Linux Copy On Write image format. Used to be the only growable image format in QEMU. It is supported only for compatibility with previous versions. It does not work on win32. 
vmdk 
VMware 3 and 4 compatible image format. 
cloop 
Linux Compressed Loop image, useful only to reuse directly compressed CD-ROM images present for example in the Knoppix CD-ROMs. 
size 
is the disk image size in kilobytes. Optional suffixes M (megabyte) and G (gigabyte) are supported 
output_filename 
is the destination disk image filename 
output_fmt 
is the destination format 
-c 
indicates that target image must be compressed (qcow format only) 
-e 
indicates that the target image must be encrypted (qcow format only) 
Command description: 
` create [-e] [-b base_image] [-f fmt] filename [size]' 
Create the new disk image filename of size size and format fmt. 
If base_image is specified, then the image will record only the differences from base_image. No size needs to be specified in this case. base_image will never be modified unless you use the commit monitor command. 
` commit [-f fmt] filename' 
Commit the changes recorded in filename in its base image. 
` convert [-c] [-e] [-f fmt] filename [-O output_fmt] output_filename'