includes aliases, builtins, and functions,ifand onlyifthe `-p'option is not also used-f suppress shellfunctionlookup-P force a PATH searchforeach NAME, evenifit is an alias, builtin, orfunction, and returns the name of the diskfilethat would be executed-p returns either the name of th...
If you need to free up a namespace occupied by a function in the current terminal session, run: unset<functionname> For example: unsetmy_function The function is no longer available in the current terminal session. However, if the code is in the~/.bashrcfile, everything is restored to n...
includes aliases, builtins, and functions,ifand onlyifthe `-p'option is not also used-f suppress shellfunctionlookup-P force a PATH searchforeach NAME, evenifit is an alias, builtin, orfunction, and returns the name of the diskfilethat would be executed-p returns either the name of th...
Write a Bash script that defines a function called multiply that takes two numbers as arguments and returns their product. This problem involves writing a Bash script that defines a function named "multiply()" to calculate and return the product of two given numbers. The function should take tw...
37. [[ -e "$broken_symlink" ]] returns 1 even though $broken_symlink exists 这里-e 选项是看文件是否存在,当紧跟的文件是一个软链接时,它不看软链接是否存在,而是看实际指向的文件是否存在。所以当软链接损坏时,即实际指向的文件被删除后,-e 的结果返回 1。
37. [[ -e "$broken_symlink" ]] returns 1 even though $broken_symlink exists 这里-e 选项是看文件是否存在,当紧跟的文件是一个软链接时,它不看软链接是否存在,而是看实际指向的文件是否存在。所以当软链接损坏时,即实际指向的文件被删除后,-e 的结果返回 1。
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 validate() { if [ ${#1} ...
在上述例子中,my_function函数将总是返回1。 下面是一个更完整的示例,展示了如何在Bash中定义函数并设置返回值: 代码语言:txt 复制 # 定义一个函数,接收两个参数,并返回它们的和 sum() { local a=$1 local b=$2 local result=$((a + b)) return $result } # 调用函数,并获取返回值 sum 2 3 resu...
The function returns the sum of all argument values. #!/bin/bash addition() { #Read the argument values n1=$1 n2=$2 n3=$3 n4=$4 #Calculate the sum of the arguments ((sum=$n1+$n2+$n3+$n4)) #Print the calculated result echo "The sum of $n1, $n2, $n3, and $n4 is $sum...
By default, a function returns the exit code from the last executed command inside the function. It will stop the function execution once it is called. You can use the return builtin command to return an arbitrary number instead. Syntax: return [n] where n is a number. If n is not ...