A 'for loop' is a bash programming language statement which allows code to be repeatedly executed. A for loop is classified as an iteration statement i.e. it is the repetition of a process within a bash script. Tutorial details For example, you can run UNIX command or task 5 times or ...
Example 5: C-style for Loop #!/bin/zshfor((i=1;i<=5;i++))doecho"Number:$i"done Practical Example: Creating Backup Files Create the script file backup.sh: nano backup.sh Add the following content: #!/bin/zshsource_dir="/path/to/source_directory"backup_dir="/path/to/backup_direct...
Then run the following script: $ bash forloop1.sh Example 2 - for Loop With a Break Statement The break statement is used within the ‘for loop’ to end the loop. First, create a file and run the following code. For instance, we will use for loop to read the list of names, and...
In Bash, the ‘foreach’ loop is commonly expressed as a ‘for’ loop. The loop operates by performing a set of commands for each item in a list. This makes it an incredibly useful tool for automating repetitive tasks. Let’s look at a simple example of a ‘for’ loop acting as a ...
The given set of items can be a literal set of objects or anything that Bash can extrapolate to a list. For example, text pulled from a file, the output of another Bash command, or parameters passed via the command line. Converting this loop structure into a Bash script is also trivial...
You can have awhileloop to keep checking for that directory's existence and only write a message while the directory does not exist. If you want to do something more elaborate, you could create a script and show a more clear indication that the loop condition became true: ...
Here, we use the sleep command with a ‘for loop’, giving you a good night message every 20 seconds. #!/bin/bash echo "For loop with sleep timer" for i in 1 2 3 4 5 do echo "Im going to sleep - day $i" && sleep 20 done echo "* end of script *" Output Example 12 ...
Updates），安全>开发者（Security > For Developers）打开新的设置页面，选择“Windows Subsystem for ...
it starts with a list of items to iterate through and works its way through them until it has reached the end. This makes it the most deterministic of the loop structures. This does not mean that the list of items has to be written out explicitly in the script itself (although it can...
/bin/bash # 定义一个数字列表 numbers=(1 2 3 4 5) # 使用for循环遍历列表并打印每个数字 for num in "${numbers[@]}" do echo "$num" done 参考链接 Bash for Loop 通过以上分析和示例代码,你应该能够理解for循环只执行一次迭代的原因,并找到相应的解决方法。