$ hello_world="value" # Create the variable name. $ var="world" $ ref="hello_$var" # Print the value of the variable name stored in 'hello_$var'. $ printf '%s\n' "${!ref}" value 或者,在bash4.3+上: $ hello_world="value" $ var="world" # Declare a nameref. $ declare -...
echo "numberTwelve variable is greater than 12" else echo "neither of the statemens matched" fi 输出如下: [zexcon@fedora ~]$ ./learnToScript.sh numberTwelve variable is equal to 12 你所看到的是if语句的第一行,它在检查变量的值是否真的等于12。如果是的话,语句就会停止,并发出numberTwelve is...
/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# (...
‘item2’, and ‘item3’. We then use a ‘for’ loop to iterate through each element in the array. The"${array[@]}"syntax is used to access all elements in the array. For each iteration, the current element’s value is stored in theivariable, which we then print out using theec...
This problem involves writing a Bash script that defines a function named "add()" to calculate and return the sum of two given numbers using a recursive approach. The function should handle the addition by incrementing or decrementing the first number until the second number is exhausted, effect...
echo "increment variable i is $i" done # closes for loop You can add a "break" command inside the loop, which I would recommend throwing into an "if then" statement for error or input checking. As well as the break command, you can have a "continue" command which automatically skips...
aws_eks_ami_create.sh - creates a custom EKS AMI quickly off the base EKS template and then running a shell script in it before saving it to a new AMI. See also HariSekhon/Packer for more advanced build aws_kms_key_rotation_enabled.sh - lists AWS KMS keys and whether they have key...
[zexcon@fedora~]$./learnToScript.shnumberTwelvevariableisequalto12 1. 2. 你所看到的是 if 语句的第一行,它在检查变量的值是否真的等于 12。如果是的话,语句就会停止,并发出 numberTwelve is equal to 12 的回显,然后在 fi 之后继续执行你的脚本。如果变量大于 12 的话,就会执行 elif 语句,并在 fi...
The script will evaluate a condition. If the condition is true, it will keep executing the commands until the output no longer meets the defined condition.#!/bin/bashwhile [condition]do[commands]doneLet’s take a look at a simple example that involves a variable and increment operator, ...
Example bash script for the for loop: #!/bin/bash for((num=0; num<5; num=num+1)) do echo "num:"$num done Here, incrementing the counter was done withnum=num+1. The script is written using let like this: #!/bin/bash