for无限循环

for ((i=0;i<1;i+=0))

do

    echo "infinite loop"

done

for ((;1;))

do

    echo "infinite loop"

done

while的无限循环

while ((1))

do

    echo "infinite loop"

done

while true

do

    echo "infinite loop"

done

while :

do

    echo "infinite loop"

done

until循环

until ((0))

do

    echo "inlinite loop"

done

until false

do

    echo "inlinite loop"

done