考虑一下我在开始提到的最简单的场景。让我们使用for循环打印从 1 到 10 的数字: 复制 #!/bin/bashfornumin{1..10};doecho$numdone 1. 2. 3. 4. 如果你运行它,你应该会看到像这样的输出: 复制 $ ./for-loop.sh12345678910 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 你也可以
首先明确一点，我们讲的行业分析，仅限于指导企业经营的行业分析。它是数据分析的一种基本方法，它和投资...
循环中断控制符有:break、continue 循环语句示例 for-in #! /bin/bash for num in 1 22 14 55 do echo $num done echo "1 2 3 4 5 loop output" for num in `seq 5` do echo $num done echo "charactor string" for str in hello world "hello, world" do echo $str done 1. 2. 3. 4....
_repeat() { #@ USAGE: _repeat string number _REPEAT=$1 while (( ${#_REPEAT} < $2 )) ## Loop until string exceeds desired length do _REPEAT=$_REPEAT$_REPEAT$_REPEAT ## 3 seems to be the optimum number done _REPEAT=${_REPEAT:0:$2} ## Trim to desired length } repeat() { ...
forloopin1 2 3 4 56doechoThe value is:$loopdone## 字符串forstrinThis is a stringdoecho$strdoneprintf"\n## 遍历数组\n"### 一for((i=0;i<${#arr[@]};i++))doecho${arr[i]}done;### 二forain${arr[@]}doecho${a}done### 三foriin"${!arr[@]}"doprintf"%s\t%s\n""$i...
在编程术语中，这被称作执行控制，for 循环就是其中最常见的一种。
while-loop For-loop 6. Script Input readline: 7. Script Output 8. Send output to one script to another script 9. Strings Processing 大于小于 拼接两个字符串 大写 10. Numbers and Arithmetic 加减乘 整除 取余数 hexadecimal to a 11. Declare Command ...
for ((i=$length-1; i>=0; i–))– theforloop iterates through thenumbers_arraystarting from the last index ($length-1) to the first index (0) reversed_numbers+=(${numbers_array[i]})– appends each element ofnumbers_arraytoreversed_numbersin reverse order ...
18 for arg in "$*" # 如果"$*"不被""引用,那么将不能正常地工作19 do20 echo "Arg #$index = $arg"21 let "index+=1"22 done # $* sees all arguments as single word. 22 done # $* 认为所有的参数为一个单词23 echo "Entire arg list seen as single word."...
In this code, we usedseqwith parameter expansion inside theforloop to iterate over each character in a string: ${#string}calculates the length of the variablestring $((${#string} – 1))subtracts 1 from the length of the string to get the highest value index as Bash uses zero-based i...