陷阱会为子shell重置,因此sleep仍然会作用于(通常是通过退出)SIGINT发送的信号^C,但父进程(即shell脚本)不会。
#!/bin/sh # Run a command on signal 2 (SIGINT, which is what ^C sends) sigint() { echo "杀死了子壳!" } trap sigint INT # Or use the no-op command for no output #trap : INT # This will be killed on the first ^C echo "Sleeping..." sleep 500 echo "Sleeping..." sleep 500
还有一个变体,它仍然允许您通过^C每秒按下两次来退出主程序:
last=0 allow_quit() { [ $(date +%s) -lt $(( $last + 1 )) ] && exit echo "Press ^C twice in a row to quit" last=$(date +%s) } trap allow_quit INT