Making ISO file on command line using "mkisofs"

Single directory to iso file

 # mkisofs -o   test.iso   test/

output would like this

I: -input-charset not specified, using utf-8 (detected in locale settings)
Total translation table size: 0
Total rockridge attributes bytes: 0
Total directory bytes: 0
Path table size(bytes): 10
Max brk space used 0
5765 extents written (11 MB)

Multiple directory to iso file

# mkisofs -o   test.iso   test/  test1/  test2/