path=/abc/bdc/dsa/gafasd/casdf
计算字符'/'个数
echo -n $path | tr '/' ' ' | wc -l
echo -n $path | sed "s/[^/]//g" | wc -c
echo $[ ${#path} - `expr length ${path///}`]
小数运算
echo "scale=10;98512/258322" | bc
path=/abc/bdc/dsa/gafasd/casdf
计算字符'/'个数
echo -n $path | tr '/' ' ' | wc -l
echo -n $path | sed "s/[^/]//g" | wc -c
echo "scale=10;98512/258322" | bc