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What is the structure of for loop in Shell programming? aiming at this problem, this article introduces the corresponding analysis and solution in detail, hoping to help more partners who want to solve this problem to find a more simple and feasible method.

For Loop structure in Shell programming

No.1 for cycle structure

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

#

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

#

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" > > ipdown.txt

Fi

} &

Done

Wait

Printf "$(date +% Y-%m-%d%k:%M:%S)-exec filename:$0\ n"

The answer to the question about the structure of the for loop in Shell programming is shared here. I hope the above content can be of some help to you. If you still have a lot of doubts to be solved, you can follow the industry information channel to learn more about it.

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