split命令：
for i in {1..30}; do num=$(printf "%05d\n" "$i");name="model-$num-of-00030.safetensors";split -b 3G $name tmp/$name-;echo $name;done
合并命令：
for i in {1..30}; do num=$(printf "%05d\n" "$i");name="model-$num-of-00030.safetensors";cat $name-* > ../$name;echo $name;done
