Ruijie Yu writes: > Try putting "cat" there. I suspect something is fed into the stdin of > the process. Can you explain in detailed? Don't know how to put command "cat" in my situation. -- [ stardiviner ] I try to make every word tell the meaning that I want to express without misunderstanding. Blog: https://stardiviner.github.io/ IRC(libera.chat, freenode): stardiviner, Matrix: stardiviner GPG: F09F650D7D674819892591401B5DF1C95AE89AC3