#!/bin/sh
b=''
for ((i=0;$i<=100;i+=2))
do
printf "progress:[%-50s]%d%%\r" $b $i
sleep 0.1
b=-$b
done
echo
progress:[--------------------------------------------------]100%
#!/bin/sh
b=''
for ((i=0;$i<=100;i+=2))
do
printf "progress:[%-50s]%d%%\r" $b $i
sleep 0.1
b=-$b
done
echo