functionmyfunc { read-p"Enter a value:"value#let value2=$value*2#echo "Double $value = $value2"return$[$value* 2] } myfunc echo"Get the function return-value: $?"#通过$?获取函数返回值 以下方式无法得到正确的返回值,请谨慎操作: ret=`myfunc`#尝试获得myfunc函数的打印消息echo"Fail to g...
function does not contain a return statement, its status is set based on the status of the last statement executed in the function. To actually return arbitrary values to the caller you must use other mechanisms. The simplest way to return a value from a bash function is to just set a gl...
For example, a bash function return value is limited to number values between 0 and 255, nor can you safely use indirection in bash. This example will implement a rand function and a shuffle function. Both functions use local and global variables to pass values around. If you need to ...
bash func bash function return 前些时候看有人定义Bash函数时,用return返回自定义的数值,1表示是,0表示否,这是用对其他语言函数的理解来定义Bash函数,这种思路在Bash里是有问题的。 下面用一个例子来给说明这种方法会碰上什么问题。定义一个简单的函数,如果输入字符串的长度大于等于8返回1,否则返回0。 function...
function f_name { …函数体… } 语法二: f_name() { …函数体… } 调用:函数只有被调用才会执行: 调用:给定函数名 函数名出现的地方,会被自动替换为函数代码: 函数的生命周期:被调用时创建,返回时终止: return命令返回自定义状态结果: 0:成功
What is a bash function? How to define and use functions in Bash? Function Variables Function Arguments Function Return How to delete a function? Nested Functions How to debug a bash function? Get an existing function definition Tracing code with traps Find where a bash function is defined ...
# Incorrect index initializationecho$var[14]# Missing {} in array referencesecho"Argument 10 is$10"# Positional parameter misreferenceif$(myfunction);then..;fi# Wrapping commands in $()elseifothercondition;then..# Using 'else if'f;f() {echo"hello world; } # Using function before ...
/bin/bash # 方法一:直接赋值 array1=("value1" "value2" "value3") # 方法二:使用索引赋值 array2[0]="value1" array2[1]="value2" array2[2]="value3" # 方法三:从字符串分割赋值 string="value4 value5 value6" array3=($string) # 方法四:使用read命令赋值 echo "Enter values separated...
# Usage: get_functions IFS=$'\n' read -d "" -ra functions < <(declare -F) printf '%s\n' "${functions[@]//declare -f }" } 绕过shell别名 # alias ls # command # shellcheck disable=SC1001 \ls 绕过shell函数 # function ls
value 1. 2. 3. 4. 5. 6. 7. 8. 根据另一个变量命名变量 $ var="world" $ declare "hello_$var=value" $ printf '%s\n' "$hello_world" value 1. 2. 3. 4. ESCAPE序列 与流行的看法相反,使用原始逃逸序列没有问题。使用tput与手动打印相同的ANSI序列的摘要。更糟糕的是,tput实际上并不便携...