shell 函数中的 x 是干啥的啊 - V2EX

shell 函数中的 x 是干啥的啊 - V2EX

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这是一个创建于 2839 天前的主题，其中的信息可能已经有所发展或是发生改变。

贴代码

release="centos"

boot_start(){ if [[ x"${release}" == x"debian" || x"${release}" == x"ubuntu" ]]; then update-rc.d -f ${1} defaults elif [[ x"${release}" == x"centos" ]]; then chkconfig --add ${1} chkconfig ${1} on fi }

3 条回复 2018-05-31 16:02:53 +08:00

1

dengshuang

OP

2018 年 5 月 31 日

boot_start(){
if [[ x"${release}" == x"debian" || x"${release}" == x"ubuntu" ]]; then
update-rc.d -f ${1} defaults
elif [[ x"${release}" == x"centos" ]]; then
chkconfig --add ${1}
chkconfig ${1} on
fi
}

2

laxenade

2018 年 5 月 31 日 via Android

1

https://stackoverflow.com/questions/1805663/shell-script-purpose-of-x-in-xvariable/

3

dengshuang

OP

2018 年 5 月 31 日

@laxenade 谢谢了

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