for((i=0;i<=1000;i++));doecho"Counter:$i"done 循环将迭代1001次,并产生以下输出: Counter:0Counter:1Counter:2... Counter:998Counter:999Counter:1000 break和continue声明 break和continue语句可用于控制for循环的执行。 break声明 break语句终止当前循环,并将程序控制权传递给终止语句之后的语句。它通常用...
你也可以从0开始,跳过最后一个,在循环外处理(上面的镜像),但是跳过最后一个通常比较脏,而且可能是不可能的(要跳过最后一个,你必须知道它是最后一个,但第一个总是可以立即跳过)。例如,如果您正在从流中读取元素,您无法提前知道哪一个是最后一个,而这种形式是唯一的选择! 另一种方式: # test a loop counterN...
You can use this construct as a way to create an infinite loop. # For-loop syntax (counter) for (( expr1 ; expr2 ; expr3 )) ; do commands done # Example of for-loop with a counter [me@linux ~]$ for ((x=0 ; x<5 ; x++)); do echo "\$x equals to $x"; done $x ...
Note: i ++ is a counter that increments by one. It looks like this in the example: 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 ...
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
After each iteration of the loop, expr3 is evaluated. This is usually use to increment a loop counter. The following example generates the n number of random numbers. Bash For Example 2. Generate n random numbers $ cat random.sh #! /bin/bash ...
BASH if/while/until loop #1/bin/bashif[ $# -eq1];thencounter="1"counter1="1"echo"for loop:"foriin$(seq1$1);doecho$idoneforiin$(seq1320);doecho"welcome $i times"donefor((i=1;i<3;i++));doecho$idoneecho"while loop"while[ $counter -le $1];doecho$counter...
printf “The counter is now %d/n” “$COUNTER” done exit 0 当循环开始时,执行双括号中的第一个表达式,每次循环开始执行第三个表达式,并检查第二个表达式,当第二个表达式返回 false ,循环结束。 $ bash forloop.sh The counter is now 1 The counter is now 2 ...
This type offorloop expects a list of values/elements and performs a single iteration for each element in the list. The list can be provided by separating each item in a single space, or you may specify a range. forCounterin1 2 3 4 5..Ndo1st statement 2nd statement nth statementdone ...
BASH if/while/until loop,#1/bin/bashif[$#-eq1];thencounter="1"counter1="1"echo"forloop:"foriin$(seq1$1);doecho$idoneforiin$(seq1320);doecho"welcome$...