Bash script eval output and grep the substring of the output to write conditions

Question

我在變量cmds中有一個命令。

在 bash 腳本$eval ${cmds[1]}上執行此命令后，它具有 output：

about to fork child process//
forked process: 1234
all output going to: /rand/direc/filename.log
child process started successfully, parent exiting.

我想在 bash 中寫一個條件，在那里我尋找“子進程已成功啟動”，並執行某些命令，

else echo -e "child process not started successfully"

Answer 1

Grep 字符串管道的執行命令通過到 tee /dev/tty 以將命令的 output 顯示到屏幕

if eval ${cmds[1]} | tee /dev/tty | grep -q "child process not started successfully"
then 
     echo "OK"
fi