问如何在C(如apt-get )中实现进度条？

EN

#!/bin/bash

## string of characters for meter (60 - good for 120 char width)
str='▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒'

tput civis                  # make cursor invisible

for i in `seq 1 100`; do    # for 1 to 100, save cursor, restore, output, restore
    printf "\033[s\033[u Progress: %s %3d %% \033[u" "${str:0:$(((i+1)/2))}" "$i"
    sleep 0.1               # small delay
done

printf "\033[K"             # clear to end-of-line

tput cnorm                  # restore cursor to normal

exit 0