If we execute the script, the counter will have the value of five: $ ./counter.sh The value of the counter is COUNTER=5 Great, our counter works! 4. The Subshell Pitfall We’ve seen how to create a counter and increment its value in aforloop. So far, so good. When we read the...
Example bash script for the for loop: bash #!/bin/bashfor((num=0; num<5; num=num+1))doecho"num:"$numdone Here, incrementing the counter was done withnum=num+1. The script is written using let like this: bash #!/bin/bashfor((num=0; num<5;))doecho"num:"$numletnum=num+1...
反向补偿需要seata拦截我们所执行的sql，并生成对应的反向补偿sql，以此来执行事务回滚。我们所使用spring集...
A‘while’ loop will continue to execute as long as the condition in the loop remains true. When working with arrays, you can use a counter and increment it in each iteration until you’ve gone through all the elements. Here’s an example: fruits=('apple' 'banana' 'cherry') index=0 ...
/bin/bash## Name: test-bucket-1## Purpose:# Performs the test-bucket number 1 for Product X.# (Actually, this is a sample shell script,# which invokes some system commands# to illustrate how to construct a Bash script)## Notes:# 1) The environment variable TEST_VAR must be set# (...
# Endless loop example with an endless counter increment [me@linux ~]$ for (( x=0 ; ; x++ )); do echo "\$x=$x"; done $x=0 $x=1 $x=2 ... The While loop The bash while-loop construct can be used to create a condition-controlled loop using a bash conditional expression,...
Provide one function to terminate the script when there are errors When possible, provide functions that do a single task well Capture the output of each script, while watching the output being produced Inside each script, capture the return code of each line command ...
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 ] ...
Let’s write a script that prints a message after each second as an example: $cat./script counter=0echo"Starting sleep"whilesleep1;do: $((counter+=1))# Increment counterecho"Slept$countertime(s)"done$timeout5 ./script StartingsleepSlept 1 time(s) Slept 2 time(s) Slept 3 time(s) ...
$# 传递给 shell script 的参数个数 $* 传递给 shell script 的参数 $@ 所有参数,个别的用双引号括起来 $? 上一个命令的返回值,默认成功为 0,失败为 1 $0 $0 当前 shell 的名字 $n 第 n 个参数 $$ 进程标识号(Process Identifier Number, PID) ...