写shell脚本的时候,我们经常会利用到数字循环,比如指定多少行至多少行删除, 扫描IP网段等,下面这里记录总结一下几种方法。
for i in {1..3};do
echo "$i What to do"
done
当然这里还可以循环字母:
for i in {a..z};do
echo "Letters is $i"
done
for i in `seq 1 3`;do
echo "num is $i"
done
for((i=1;i<=3;i++));do
echo "Cycle number is $i"
done
i=1
while(($i<=3));do
echo "while run num is $i"
i=$(($i+1))
done