. # The return statement terminates the function. # You can think of it as the function’s exit status. return 55}# assigning to the func_result variable using the $() mechanismfunc_result=$(greeting 'Joe')# console: return:55echo "return:$?"# console: func_result:Hello Joeec...
函数(function)是可以重复使用的代码片段,有利于代码的复用。它与别名(alias)的区别是,别名只适合封装简单的单个命令,函数则可以封装复杂的多行命令。函数总是在当前 Shell 执行,这是跟脚本的一个重大区别,Bash 会新建一个子 Shell 执行脚本。如果函数与脚本同名,函数会优先执行。但是,函数的优先级不如别名,即如果...
az account show --query [name,id,user.name] # return multiple values az account show --query [name,id,user.name] -o table # return multiple values as a table For more information about returning multiple values, see Get multiple values. Renaming properties in a query The following querie...
Most of the time when you’re writing bash scripts you won’t be comparing two raw values or trying to find something out about one raw value, instead you’ll want to create a logical statement about a value contained in a variable. Variables behave just like raw values in logical express...
A Bash function is essentially a set of commands that can be called numerous times. The purpose of a function is to help you make your bash scripts more readable and to avoid writing the same repeatedly.
type命令的-t参数,可以返回一个命令的类型:别名(alias),关键词(keyword),函数(function),内置命令(builtin)和文件(file)。 $ type -t bash file $ type -t if keyword 上面例子中,bash是文件,if是关键词。 快捷键 Bash 提供很多快捷键,可以大大方便操作。下面是一些最常用的快捷键,完整的介绍参见《行操作...
# Multiple arguments can also be passed. $ random_array_element 1 2 3 4 5 6 7 3 1. 2. 3. 4. 5. 6. 7. 循环一个数组 每次printf调用时,都会打印下一个数组元素。当 打印到达最后一个数组元素时,它 再次从第一个元素开始。 arr=(a b c d) ...
Bash cannot return values, whether a single value or an array, but it can return a status (the same as other programs). However, there are multiple turnarounds that we can use to return an array from a function. Let’s explore them below. Using nameref Feature To return the entire ar...
根据wait手册页,wait with multiple pid's只返回等待的最后一个进程的返回值。因此,您需要一个额外的循环,并按照答案中的建议分别等待每个PID。 @尼尔斯:你说得对,对不起。所以应该是:for i in $n_procs; do ./procs[${i}] & ; pids[${i}]=$!; done; for pid in ${pids[*]}; do wait $pid...
Created aremote_copyfunction, which uses a timeout to make sure thescpfinishes no later than 45.0s—line 33. Added a connection timeout of 5 seconds instead of the TCP default—line 37. Added a retry toscpon line 38—3 attempts that wait 1 second between each. ...