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在脚本中捕获 Ctrl C

tag-icon • tag-icon shell-script trap
在脚本中捕获 Ctrl C

我需要弄清楚如何捕获 Ctrl C，这样如果我想提前结束脚本，它可以重新启用挂起和休眠模式。

我查看了其他有关捕获 Ctrl C 的讨论，但没有找到有帮助的。

谢谢。

#     TimerInTerminal.sh

# To prevent your Linux system from suspending or going into hibernation, you need to disable the following systemd targets:
# sudo systemctl mask sleep.target suspend.target hibernate.target hybrid-sleep.target

# To re-enable the suspend and hibernation modes, run the command:
# sudo systemctl unmask sleep.target suspend.target hibernate.target hybrid-sleep.target

soundfile="/usr/share/sounds/My_Sounds/Electronic_Chime.wav"
# Stop computer from sleeping while timer is running

# prevent your Linux system from suspending or going into hibernation
sudo systemctl mask sleep.target suspend.target hibernate.target hybrid-sleep.target

# This allows supend ?
#trap "echo marlin | sudo -S systemctl mask sleep.target suspend.target hibernate.target hybrid-sleep.target" INT EXIT

if [ $# -eq 1 ]
then
    DURATION="$1"
else
    read -r -p "Timer for how many minutes?( for fractional, use decimal notation , 0.5==30s, 1.25==75s etc) : "  DURATION
    read -r -p "Enter text to display at the end of the timer : " n1
fi

DURATION=$(echo "$DURATION * 60 / 1" | bc) # lets us deal with fractional inputs

START=$(date +%s)   # only do this once (anchor's the time)

countdown () {
    NOW=$(date +%s)              # Get time now in seconds
    DIF=$((NOW - START))         # Compute diff in seconds
    ELAPSE=$((DURATION - DIF))   # Compute elapsed time in seconds
    MINS=$((ELAPSE / 60))        # Convert to minutes... (dumps remainder from division)
    SECS=$((ELAPSE - (MINS*60))) # ... and seconds
    #banner "$MINS:$SECS"
    echo "$MINS:$SECS"
    sleep "$1"
}

while true 
do
    clear
    
    countdown 0 # calc time remaining
    
    if [ $MINS -le 0 ]
    then
        # Blink screen

        while [ $SECS -gt 0 ]
        do
            
            clear # Flash on
            #setterm -term linux -back red -fore white 
            countdown 0.5

            clear # Flash off
            #setterm -term linux -default
            countdown 0.5

        done # End for loop
        
        setterm -term linux -default
        clear
        
        break   # time has expired lets get out of here
    
    else
        countdown 1 
    fi
done

echo $n1
amixer -D pulse sset Master 30% > /dev/null 2>&1
# Play a sound
cvlc --play-and-exit "$soundfile" > /dev/null 2>&1

# To re-enable the suspend and hibernation modes, run the command:
 echo marlin | sudo -S systemctl unmask sleep.target suspend.target hibernate.target hybrid-sleep.target

答案1

将其添加到脚本顶部附近的某个位置：

trap cleanup SIGINT

cleanup () {
    sudo systemctl unmask sleep.target suspend.target hibernate.target hybrid-sleep.target
}

我不确定为什么marlin当您重新启用时要通过管道发送到 systemctl，但是您注释掉的 trap 命令可能仍然有效，除非您使用它mask而不是unmaskfwiw。尽管值得注意的是，通过捕获 forINT和EXIT当您按ctrl+时，c您的命令将被执行两次。

答案2

我已经尝试过jesse_b 的回答上面，但它对我不起作用，因为Ctrl+之前的进程C有点阻塞进程，所以我要做的就是将该函数放在陷阱调用之前。

#!/bin/bash

trp()
{
    sudo airmon-ng stop wlp2s0mon
    service NetworkManager start
}

trap trp SIGINT

sudo airmon-ng check kill
sudo airmon-ng start wlp2s0
sudo aireplay-ng --deauth 0 -a bb:bb:bb:bb:bb:bb -c cc:cc:cc:cc:cc:cc wlp2s0mon

所以在这里，它在陷阱之前注册了该函数，然后陷阱才能成功使用，否则当该函数位于该aireplay-ng行之后时，我收到此错误：

Line 1: trp: command not found

对于那些想知道的人来说，这只是一个脚本，可以让我的侄子在午夜时关闭 wifi，这样他就可以离开 TikTok 去睡觉了。

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