shell 函数中的 x 是干啥的啊

This topic created in 2921 days ago, the information mentioned may be changed or developed.

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 replies • 2018-05-31 16:02:53 +08:00

dengshuang

May 31, 2018

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
}

laxenade

May 31, 2018 via Android

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

dengshuang

May 31, 2018

@laxenade 谢谢了