If you don’t specify the keyword “in” followed by any list of values in the bash for loop, it will use the positional parameters (i.e the arguments that are passed to the shell script). $ cat for3.sh i=1 for day do echo "Weekday $((i++)) : $day" done $ ./for3.sh ...
文章被收录于专栏:howtouselinux 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 dis...
转自:linux按行读取 (while read line与for-loop) 在linux下一般用while read line与for循环按行读取文件。现有如下test.txt文件: 1. while read line whileread line;doecho $line done< test.txt 输出结果与上图一致。 这里也可以写为: cat test.txt |whileread line;doecho $line done 输出结果一致,但...
linux按行读取 (while read line与for-loop) 在linux下一般用while read line与for循环按行读取文件。现有如下test.txt文件: 1. while read line 代码语言:javascript 复制 whileread line;doecho $line done<test.txt 输出结果与上图一致。 这里也可以写为: 代码语言:javascript 复制 cat test.txt|whileread ...
If you want to do something more elaborate, you could create a script and show a more clear indication that the loop condition became true: #!/bin/bashwhile[!-ddirectory_expected]doecho"`date`- Still waiting"sleep1doneecho"DIRECTORY IS THERE!!!" ...
fruit=orange; and on the third and final iteration,fruit=pear. Once it has completed the loop, the script continues normal execution with the next command after thedonestatement. In this case, it ends by saying “Let’s make a salad!” to show that it has ended the loop, but not the...
在linux下一般用while read line与for循环按行读取文件。现有如下test.txt文件: 1. while read line whileread line;doecho $line done<test.txt 1. 2. 3. 复制 输出结果与上图一致。 这里也可以写为: cat test.txt|whileread line;doecho $line ...
Method 1: Bash For Loop using “in” and list of values Syntax: for varname in list do command1 command2 .. done In the above syntax: for, in, do and done are keywords “list” contains list of values. The list can be a variable that contains several words separated by spaces. If...
Linux-scripts-循环 9.Scripts本章同步视频:https://edu.51cto.com/sd/e4874 9.5循环 (loop) 9.5.1 while do done 1.格式与说明 while condition do statements done condition表示判断条件,statements表示要执行的语句(可以只有一条,也可以有多条),do和done都是 Shell 中的关键字。
在linux下一般用while read line与for循环按行读取文件。现有如下test.txt文件: 1. while read line while read line; do echo $line done < test.txt 输出结果与上图一致。 这里也可以写为: cat test.txt | while read line; do echo $line