intvar=12.3#Trying to store string type value to an integer variable echo $intvar declare-r rovar=281rovar=212# Trying to change the readonly variable. 从下面的执行中,您可以在将无效数据分配给变量时注意到错误消息。 $./declar.sh123t.sh:line6:12.3:syntax error:invalid arithmeticoperator(error...
3.1. Global vs. Local variables #!/bin/bash #Define bash global variable #This variable is global and can be used anywhere in this bash script VAR="global variable" function bash { #Define bash local variable #This variable is local to bash function only local VAR="local variable" echo $...
[ken@Dell-Desktop ~]$declare -r c1=3[ken@Dell-Desktop ~]$echo$c13[ken@Dell-Desktop ~]$c1=4-bash:c1:readonly variable 我们通过declare -r声明了一个只读(readonly)的变量c1,之后如果尝试修改它的话,就会提示失败。 其实这个declare的用法颇有一点复杂,这里稍微进一步介绍下 点击查看代码 [ken@Dell-D...
当然也有const、global这些属性。 使用declare声明变量的类型。 $ declare -a array # 声明了一个数组 $ declare -i sum=1+2 # sum=3 $ declare -x sum #给sum加入全局属性,即变为全局变量 $ declare +x sum # 取消全局属性 4. 查看变量 使用env(enviroment)查看环境变量。(只显示部分) 使用export...
Lines 1-2 declare variablesvar1andvar2and set them both to1. Lines 5-6 are inside the function's body and print the variables to the console. Since the variable scope is global, the original values print out. Line 7 declares a new local variable with the same name as the global varia...
Variable outside function: Explanation: In the exercise above, Define a function named "my_function". Inside the function, we declare a local variable named 'inside_variable' and assign it a value. We then call the function "my_function", which prints the value of 'inside_variable' inside...
unset take the variable name as an argument, so don’t forget to remove the $ (dollar) sign in front of the variable name of your array. See the complete example below. [me@linux ~]$ declare -A myArray=([one]=un [two]=deux [three]=trois) [me@linux ~]$ echo ${myArray[*]}...
env | export | printenv |declare -x 严格意义上的Bash变量类型 Bash Variables Are Untyped Unlike many other programming languages, Bash does not segregate its variables by "type." Essentially,Bash variables arecharacter strings, but, depending on context, Bash permits arithmetic operations and compari...
* To fix completion issue by moving global vairables into function _nvme_subcmds. It is not only suite for bash completion system but also support manually source bash script. * Fix pluginx_sfx_opts spell error to plugin_sfx_opts. * Correct variable NO_OPTS used in bash assginment. Signed...
$$ 表示当前运行脚本的进程ID号 $!...:从0开始编号 声明数组: declare -a Array_Name 关联数组: bash从4.0版本起支持关联数组:数组索引可为自定的字符串; declare -A ARRAY_NAME...从键盘让用户输入几个文件,脚本能够将此几个文件归档压缩成一个文件; #!