Shell programming-sum and bubble sort from 1 to 100

Shell Programming

A. for Loop

• Build List {start number: End number}
• Command generation list ' seq [number of start] [step length] End number '

For L in {1..5};d o

For L in ' seq 5 ';d o

1 to 100 of the cumulative sum and

1 #!/bin/bash2 declare-i sum=034 for in { 1.. ;  Do 5     sum=$[$SUM +$i]6done78"$SUM" 

Two. Arrays

Array variable definition

$ arr={1,2,3,4,5,6}

Gets the first element by default

$echo $arr

Access by subscript, following the second element of the array, subscript starting from 0

$echo ${arr[1]}

Accessing the entire array

$echo ${arr[@]} or echo ${arr[*]}

Gets the length of the array

$echo {#arr [@]}

Slice method gets a subset of the array

$echo ${arr[@]:1:2}

Implementation of bubble sort

1#!/bin/Bash2 3Echo"Please input a number list:"4Read-a arr5 6  for((i=0; i<${#arr [@]};i++));7  Do8     for(j=${#arr [@]}-1; j>i;j--));9     DoTen        if[[${arr[j]}-lt ${arr[j-1]} ]] One  Then At=${arr[j]} -arr[j]=${arr[j-1]} -arr[j-1]=$t the fi -  Done -  Done -  +Echo"After sorting:" -Echo ${arr[@]}

Shell programming-sum and bubble sort from 1 to 100