“STRING” 将会阻止(解释)STRING 中大部分特殊的字符。后面的实验会详细说明。 单引号(’) ‘STRING’ 将会阻止 STRING 中所有特殊字符的解释,这是一种比使用"更强烈的形式。后面的实验会详细说明。 反引号(`) 命令替换 反引号中的命令会优先执行,如: cp `mkdir back` test.sh back ls 先创建了 back 目录...
Alternatively, use arrays if your string contains whitespace. In addition to allowing the bash loop to read space-separated items, they are easier to iterate and expand. Here’s the syntax: array=("First item" "Second item" "Third item" "Fourth item") for item in "${array[@]}" do ...
5.3.利用function功能 6.循环loop 6.1 while do done, until do done (不定循环) 6.2 for...in...do...done (固定循环) 6.5 for...do...done 的数值处理 7.shell script的追踪与debug 四、补充 1.打印进度条 2.文件描述符(参考第一章18小节) 3.进程检测 4.关于双方括号 5.注释 6.引号 7.关于...
bashtrap(){ echo "CTRL+C Detected !...executing bash trap !"}# for loop from 1/10 to 10/10for a in `seq 1 10`; do echo "$a/10 to Exit." sleep 1;doneecho "Exit Bash Trap Example!!!" 8. Arrays 8.1. Declare simple bash array #!/bin/bash #Declare array with 4 elements ...
In this example, we first added “Australia” to ourcountriesarray using+=. We then removed the second element (“UK”) usingunset. The updated array is then printed out, showing the changes. Looping Through Arrays You can iterate through the elements of a Bash array using aforloop. Here...
Bash while Loop Iterate through an Array An array stores multiple elements of the same data type. Loop structures serve as a fundamental tool for iterating through arrays and performing operations on each of their elements. For example, let’s create a Bash script that has an array of 5 ele...
If you’re making Bash programs for you or for others to use one way you can get user input is to specify arguments for users to provide to your program, as we discussed in the previous section. You could also ask users to type in a string on the command line by temporarily stopping...
How to do a foreach loop in bash? How to do a do-while loop in bash? How to create an infinite loop in bash? How to find if a number is odd or even in bash? How to iterate over a bash array? How to loop over each line of a file? How to iterate over a list of files?
var = 42# Spaces around = in assignments$foo=42# $ in assignmentsfor$varin*;do...# $ in for loop variablesvar$n="Hello"# Wrong indirect assignmentecho${var$n}# Wrong indirect referencevar=(1, 2, 3)# Comma separated arraysarray=( [index] = value )# Incorrect index initializationech...
for loop in 1 2 3 4 5 do echo "The value is: $loop" done 输出结果: The value is: 1 The value is: 2 The value is: 3 The value is: 4 The value is: 5 while循环用于不断执行一系列命令,也用于从输入文件中读取数据;命令通常为测试条件。其格式为: ...