export LD_LIBRARY_PATH

LD_LIBRARY_PATH

程序运行时依赖库的位置，默认是

lib  
/usr/lib  
/usr/local/lib

通过命令export LD_LIBRARY_PATH=path:$LD_LIBRARY_PATH追加用户库文件路径。

注意事项

通过export添加的环境变量仅针对当前运行shell生效，退出后被重置，而且重新启动的shell也不会继承。

问题记录

export LD_LIBRARY_PATH=path:$LD_LIBRARY_PATH
sudo ./xxx

cannot open shared object file: No such file or directory

测试发现sudo运行这一步不在当前shell，导致export LD_LIBRARY_PATH=path:$LD_LIBRARY_PATH无效，
只能sudo LD_LIBRARY_PATH=path:$LD_LIBRARY_PATH ./xxx才能执行

shell环境测试(Ubuntu 22.04)

$ps
  PID TTY          TIME CMD
 7346 pts/1    00:00:00 bash
 7393 pts/1    00:00:00 ps
$sudo ps
  PID TTY          TIME CMD
 7395 pts/2    00:00:00 sudo
 7396 pts/2    00:00:00 ps