A loop is used to repeat a set of statements repeatedly. The Bash FOR loop is the most basic type of loop, which is used for iteration. Other than this, there are two more types of loops: the while loop and the do-while loop. Imagine that you want to run a single statement multipl...
Caution: As a best practice, you should always quote the bash variables when you are referring it. There are few exceptions to this best practice rule. This is one of them. If you double quote the variable in this for loop, the list of values will be treated as single value. Lot of ...
In the above bash for command syntax, before the first iteration, expr1 is evaluated. This is usually used to initialize variables for the loop. All the statements between do and done is executed repeatedly until the value of expr2 is TRUE. After each iteration of the loop, expr3 is eval...
You can use variables inside loops to iterate over a range of elements. This is whereC-styled for loopscome in. The following example illustrates aC-style for loopthat prints out a list of numerical values from 1 to 7. #!/bin/bash n=7 for (( n=1 ; n<=$n ; n++ )); do echo...
unix 如何将bash for循环脚本中的两个变量作为一对进行赋值？[duplicate]如果你只需要元素对，就不需要...
How to find if a number is odd or even in bash? How to iterate over a bash array? How to loop over each line of a file? How to iterate over a list of files? How to use numbers with leading zeros in a bash loop? How to iterate over a range of numbers defined by variables?
for n in a b c d e do while true do if [ $RANDOM -gt 20000 ] then printf . break 2 ## break out of both while and for loops elif [ $RANDOM -lt 10000 ] then printf '"' break ## break out of the while loop fi done done echo 继续 在循环内部, continue命令通过传递任何剩余...
In this script, the ‘for’ loop iterates over the numbers 1 through 10. For each iteration, the ‘if-elif-else’ statement checks if the current number is equal to 5 or 7 and prints a message accordingly. ‘Else If’ with Functions ...
注意,有些部分并 有 bash shell 的for命令: 变量 可以有 空格; 条件中的变量不以美元符开头 ; 迭代过程的算式未用expr命令格式。 $ cat test8 #!/bin/bash # testing the C-style for loop for (( i=1; i <= 10; i++ )) do echo "The next number is $i" done ...
(a term often used in Linux/Bash circles to conceptualize a mini-script written on a single line) will print the numbers 1 to 5 in sequential order. We set a start value for theivariable ($i) by assigning the value1to the same, as the first part of ourforloop definition, terminated...