Bash 脚本使用 if function 导出变量

Question

I got some not working script about checking if the variable is empty, and based on this create the next variable and export it.

export VARIABLE=macmac123

if [ -z "$VARIBLE" ]
then 
      unset $VAR2 
else 
      export VAR2="test"
fi

Next I run this script./script.sh and then running echo $VAR2 doesn't show anything. Any ideas? I can't change the whole script, because I need this, but it doesn't export anything into environmental variables.

Answer 1

Shell scripts are executed in a subshell. If you want the variables in the current shell you have to source the script like: source script.sh or . script.sh . script.sh (dot is an alias for source ).