Shell 壳程杆

我想要一个进度条，告诉我直到什么时候pkg更新进度这是我的代码，请纠正它，如果你有一个更好的，然后请给它

#!/bin/bash
# progress bar function
prog() {
    local w=80 p=$1;  shift
    # create a string of spaces, then change them to dots
    printf -v dots "%*s" "$(( $p*$w/100 ))" ""; dots=${dots// /.};
    # print those dots on a fixed-width space plus the percentage etc.
    printf "\r\e[K|%-*s| %3d %% %s" "$w" "$dots" "$p" "$*";
}
x=1
# test loop
while [ pkg update -y ]
 do
    prog "$x" still working...
    sleep .1
    ((x++))
done ; echo

看看有什么想法