What is the structure of for loop in Shell programming
Editor to share with you what the structure of the for loop in Shell programming is. I hope you will get something after reading this article. Let's discuss it together.
For i in {value range}
Do
Cyclic body
Done
Find the sum of the numbers from 1 to 100, the numbers divisible by 2 from 1 to 100, the primes from 1 to 100, and the numbers divisible by 3 from 1 to 100.
#! / usr/bin/env bash
#
# Author: bavdu
# Email: bavduer@163.com
# Github: https://github.com/bavdu
# Date: 2019 Compact
Sum=0
For i in {1..100}
Do
Let total=$sum+$i # or write as let total=i++
Done
Printf "$total\ n"
Test host viability in production environment
#! / usr/bin/env bash
#
# Author: bavdu
# Email: bavduer@163.com
# Github: https://github.com/bavdu
# Date: 2019 Compact
> ip_alive.txt
> ip_down.txt
Export segment= "192.168.161"
For i in {2..254}
Do
{
Ping-C1 $segment.$i & > / dev/null
If [$?-eq 0]; then
Printf "alive: $segment.$i\ n" > > ip_alive.txt
Else
Printf "down: $segment.$i\ n" > > ip_down.txt
Fi
} &
Done
Wait
Printf "$(date +% Y-%m-%d_%k:%M:%S)-exec filename:$0\ n"
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