[Bash] for loop The basic syntax of a for loop in Bash is: forvariableinlistdocommandsdone Examples Example 1: Iterating Over a List of Words #!/bin/zshforwordinapple banana cherrydoecho"The word is:$word"done Example 2: Iterating Over a Range of Numbers...
While one can use the for loop for numbers and strings, programmers can even leverage the same to repeat over a range. For example, we will state an array - Players and iterate over each of the elements of the range. PLAYERS=('Cristiano Ronaldo' 'Lionel Messi' 'Iker Casillas') for pla...
There is no good reason to use an external command such as seq to count and increment numbers in the for loop, hence it is recommend that you avoid using seq. The builtin command are fast. Three-expression bash for loops syntax This type of for loop share a common heritage with the C...
Caution:Please be careful if you use this method. You should not include the keyword “in” in the for loop. If you leave the keyword “in” without any values, it will not use the positional parameter as shown below. It will not go inside the loop. i.e for loop will never get ex...
Another example for counting only even numbers: Using the for loop on the command line is also very convenient for working with files. For example, you need a backup copy of some PDF files, then the command will look like this: Or suppose you need to change the extension of some files ...
How do I use bash for loop to repeat certain task under Linux / UNIX operating system? How do I set infinite loops using for statement? How do I use three-parameter for loop control expression? A 'for loop' is a bash programming language statement which allows code to be repeatedly execu...
bash for loop examples To process the list of five numbers and print their values. for i in 1 2 3 4 5 do echo “Value is $i” done Value is 1 Value is 2 Value is 3 Value is 4 Value is 5 In this example: i is used as variable name, a short name for index value, most co...
1is also tested if it is less than or equal to5, it returns true, and the for loop printsnumber: 1. This process repeats itself until the condition returns false and theforloop exits. #!/bin/bashmax=5printf"Print Numbers from 0 to$max\n"for((x=0;x<=max;x++));doprintf"number...
Bash for Loop With a Number When working with numbers in the bash loop, you can use a span instead of specifying the items individually. To do so, add the range in curly braces separated with double dots: for i in {1..5} do echo "$i" done ...
#!/bin/bash # 定义一个数字列表 numbers=(1 2 3 4 5) # 使用for循环遍历列表并打印每个数字 for num in "${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。 相关搜索:js for循环只执行一次Python...