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Thanks for the answers.

I already switched it. when I answered you i was in a hurry and just experimented your code and didn't even analyzed it as i should've, because i had never used * operand...

No, that will output if sufix=2(along the for cycle and if you replace sprintf with a printf):
rename videofile_TypeA_2 videofile_TypeA_2.yuv
rename videofile_TypeA_02 videofile_TypeA_02.yuv...

Hi,

i already googled it but i couldn't found an adequate answer so here it goes.

Im trying to replace the instruction:

sprintf (command, "rename %s_TypeA_%04d %s_TypeA_%04d.yuv\n",...