This type of for loop is characterized by counting. The range is specified by a beginning (#1) and ending number (#5). The for loop executes a sequence of commands for each member in a list of items. A representative example in BASH is as follows to display welcome message 5 times wit...
line done 使用while循环 while read -r line do echo $line done < filename While循环中read命令从标准输入中读取一行,并将内容保存到变量...line中。...在这里,-r选项保证读入的内容是原始的内容,意味着反斜杠转义的行为不会发生。输入重定向操作符文件file,然后将它作为read命令的标准输入。......
If it is false, the loop is terminated. If the TEST is true, commands inside the body of the for loop are executed, and the STEP part is updated. In the following example code, the loop starts by initializing i = 0, and before each iteration, checks if i≤ 10. If true, it ...
If you use bash on the command line, this will not guarantee that for loops are inserted into the script. In order to prevent this, it is easiest to use loops directly on the command line and then there will be no problems. How to use a one-line bash for loop Use one of the synt...
三元表达式bash for循环语法这种for循环与C编程语言有一个共同的传统。...${countNameservers} nameservers defined in ${file}" break fidone 使用continue语句若要继续封闭FOR、WHILE或UNTIL循环的下一个迭代...总结您通过各种示例学习了如何使用bash for loop。 For循环可以节省时间,并可以帮助您自动完成微小的...
本教程将讨论编写 Bashfor循环的可用 Bash 脚本公式。 ADVERTISEMENT 首先,我们将学习它的基本语法和概念。稍后,我们将在 Bash 脚本中学习它的不同类型,例如 C 风格的for循环表示法和foreach或for-in风格。 最后,我们将讨论分号;的问题。在 bash 提示符中进行for循环时。
# for (( ; ; )); do echo "Hello World!"; done # while true; do echo "Hello World!"; done # while :; do echo "Hello World!"; done 1. 2. 3. Bash For Loop In One Line with Files # for i in *; do echo "Found the following file: $i"; done ...
foriin{1..5};doecho$i;done# Output:# 1# 2# 3# 4# 5 Bash Copy In this example, we’ve created a ‘for’ loop that acts as a ‘foreach’ loop. The loop iterates over the numbers 1 through 5, echoing each number on a new line. This is a basic way to use the ‘foreach...
for i in {0..20..5} do echo "Number: $i" done Over Array Elements 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 ...
After each iteration of the loop, expr3 is evaluated. This is usually used to increment a loop counter. The following 12 examples shows how to bash for loops in different ways. 1. Static values for the list after “in” keyword