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 ...
For example, the below-given Bash script is printing numbers 1 to 5 to the standard output. Use thebreakstatement to exit the loop when the counter reaches 4. #!/bin/bash i=0 while [ $i -lt 5 ] do i=$(( $i+1 )) if [ $i -eq 4 ] then break fi echo $i done Bash while...
With this operator until loop output: bash foc@fedora:/tmp$ ./counter.shnum: 0 num: 1 num: 2 num: 3 num: 4 num: 5 num: 6 num: 7 Counter continued to increase by one. Summary We explained the use of counters in Bash. We gave examples with frequently used loops. The help menu ...
The script initializes a counter variable 'ctr' to 10. Then, it enters a while loop that continues as long as 'ctr' is greater than 0. Inside the loop, it prints the current value of 'ctr' and decrements it by 1 in each iteration. Finally, after the loop, it prints "Bash Script!
# test a loop counterN = lengthofarrayloopwith indices:ifi==N-1:printa[i] else:printa[i],"or" Run Code Online (Sandbox Code Playgroud) 请注意,这种情况需要您知道有多少个元素,并且它会不断测试索引。因此,您必须循环索引,或者单独跟踪索引(在循环之前设置 i=0,在循环内部设置 i++)。
Using for loop in {START..END..INCREMENT} range going backward Using for loop with 3 parts and condition counter Using for loop with 3 parts and multiple conditions and actions with comma Using Infinite for loop Using for loop with conditional break and continue ...
counter=1 while [ $counter -le 10 ]; do echo $counter counter=$((counter+1)) done Let's break it down. counter=1: It is a variable namedcounterthat is initialized at 1. [ $counter -le 10 ]: It is a condition that means the loop will be iterated as long as the value of the...
BASH if/while/until loop,#1/bin/bashif[$#-eq1];thencounter="1"counter1="1"echo"forloop:"foriin$(seq1$1);doecho$idoneforiin$(seq1320);doecho"welcome$...
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 ...
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 ...