标签:__ Shell sourced script 多次重复 echo source eval
https://kodango.com/avoid-repeated-source-in-shell
${!_sourced_}是间接引用,这个执行没问题,source 会报错 bad substitution
_sourced_="__sourced_$$__" echo "Flag variable $_sourced_=${!_sourced_}" if [ -z "${!_sourced_}" ]; then eval "$_sourced_=1" echo "It is the first time to source script" else echo "The script have been sourced" fi
改为下面就可以正常source
_sourced_="__sourced_$$__" sourced=`eval echo '$'"$_sourced_"` echo "Flag variable $_sourced_=${sourced}" if [ -z "${sourced}" ]; then eval "$_sourced_=1" echo "It is the first time to source script" else echo "The script have been sourced" fi
或者
_sourced_="__sourced_$$__" eval sourced=\$$_sourced_ echo "Flag variable $_sourced_=${sourced}" if [ -z "${sourced}" ]; then eval "$_sourced_=1" echo "It is the first time to source script" else echo "The script have been sourced" fi _sourced_="__sourced_$$__" echo $_sourced_
标签:__,Shell,sourced,script,多次重复,echo,source,eval 来源: https://www.cnblogs.com/sinferwu/p/16196946.html
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