[英]Passing spaced string as argument to function
I'm trying to make an install function like this: 我试图做这样的安装功能:
function call_fedora(){
yum -y install $1;
}
function network_tools(){
tools='net-tools traceroute nmap'
call_fedora $tools;
}
But when I call network_tools function, only net-tools
is passed as argument to call_fedora
. 但是,当我调用network_tools函数时,只有net-tools
作为参数传递给call_fedora
。 I would like the call to be: 我希望电话是:
yum -y install net-tools traceroute nmap
Bash is actually passing call_fedora
the entire string net-tools traceroute nmap
as one argument. Bash实际上将整个字符串net-tools traceroute nmap
传递给call_fedora
作为一个参数。 A robust way I know of to do what you want in bash is to use array expansion: 我知道在bash中执行所需操作的一种可靠方法是使用数组扩展:
function call_fedora(){
yum -y install "$@" # "$@" means "$1" "$2" ...
}
function network_tools(){
tools=(net-tools traceroute nmap "some funky package with spaces")
call_fedora "${tools[@]}"
# keep relationship between array elements and args of call_fedora
}
The "$@"
means that each parameter to call_fedora
will be passed as a separate parameter to yum
. "$@"
表示将call_fedora
每个参数作为单独的参数传递给yum
。 The double-quotes mean the parameters can include spaces (it's a good habit to have). 双引号表示参数可以包含空格(这是一个好习惯)。
Then, you need to make sure your tools
are passed as separate arguments to call_fedora
. 然后,您需要确保将您的tools
作为单独的参数传递给call_fedora
。 Making them an array makes it easy to keep them separate. 将它们制成数组可以很容易地将它们分开。 The "${tools[@]}"
gives you each array element as a separate parameter, properly quoted ( original source ). "${tools[@]}"
为您提供每个数组元素作为单独的参数,并用正确的引号引起来( 原始来源 )。
Edit As @chepner points out in his comment below , there are simpler, more portable techniques for this use case. 编辑 @chepner在下面的评论中指出,此用例有更简单,更可移植的技术。
我建议将$1
替换$1
$@
。
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