Bash 捕捉SIGINT或Ctl + C
示例
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
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