Example-1: Iterate the loop for a fixed number of times Create a bash file named while1.sh with the following content. Here, the loop will iterate 5 times and print the counter value in each iteration. #!/bin/bash # Initialize the counter n=1 # Iterate the loop for 5 times while ...
It is always a good practice to use fewer lines of code. The while loop in Bash also offers a one-liner structure. The syntax of Bash while loop as a one-liner is given below: while [condition]; do commands_to_execute; done Let’s implement the above example using the single-line B...
Bash While loop example A While loop in a Bash script will trigger a series of commands to run repeatedly for as long as the condition result is “True.” Below is an example of Bash While loop syntax. Example: Explicit example:
In the following example, we are using the built-in command : to create an infinite loop. : always returns true. You can also use the true built-in or any other statement that always returns true.while : do echo "Press <CTRL+C> to exit." sleep 1 done Copy ...
Bash Until Example 6. Waiting for the Machine to come up This example is used to wait till the machine comes up before doing a ssh to that machine. The until loop statement ends only when the ping gives the responses. $ cat mac_wait.sh ...
Still confused? Let's have a look at one simple example. Here's a simple loop that prints from 1 to 10: #!/bin/bash counter=1 while [ $counter -le 10 ]; do echo $counter counter=$((counter+1)) done Let's break it down. ...
Example 02: Let’s look at another one-line “while” loop used in the Bash code. This code will be similar to the previous example code but with a slight change. So, we open the same Bash file and update the code. We have been using the same “while true” statement to start the...
syntax:until expressiondocommands #bodyofthe loop done 在上面的 bash until 语法中: where until, do, done 是关键字 表达式 任何条件表达式 Bash until Example 5. 监控日志文件 此示例监视日志文件的大小,一旦日志文件大小达到 2000 字节,它将获取该日志文件的副本。
bashwhile-loopscopesh 279 在下面的程序中,如果我在第一个`if`语句内将变量$foo设置为值1,那么它的值会被记住并保留在`if`语句之后。然而,当我在一个`while`语句内的`if`内将同一变量设置为值2时,它会在`while`循环后被遗忘。它的行为就像我在`while`循环内使用了某种变量$foo的副本,并且我只修改了该...
问Bash中的While-loop子壳困境ENbash中的变量