BASH - 使用陷阱 ctrl+c
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BASH - using trap ctrl+c
提问by mar_sanbas
I'm trying to execute commands inside a script using read, and when the user uses Ctrl+C, I want to stop the execution of the command, but not exit the script. Something like this:
我正在尝试使用 read 在脚本内执行命令，当用户使用Ctrl+ 时C，我想停止命令的执行，但不退出脚本。像这样的东西：
#!/bin/bash
input=
while [ "$input" != finish ]
do
read -t 10 input
trap 'continue' 2
bash -c "$input"
done
unset input
When the user uses Ctrl+C, I want it to continue reading the input and executing other commands. The problem is that when I use a command like:
当用户使用Ctrl+ 时C，我希望它继续读取输入并执行其他命令。问题是当我使用如下命令时：
while (true) do echo "Hello!"; done;
It doesn't work after I type Ctrl+Cone time, but it works once I type it several times.
在我输入Ctrl+C一次后它不起作用，但是一旦我输入几次它就起作用。
回答by Gilles Quenot
Try the following code :
试试下面的代码：
#!/bin/bash
# type "finish" to exit
# function called by trap
other_commands() {
printf "\rSIGINT caught "
sleep 1
printf "\rType a command >>> "
}
trap 'other_commands' SIGINT
input="$@"
while true; do
printf "\rType a command >>> "
read input
[[ $input == finish ]] && break
bash -c "$input"
done
回答by cdarke
You need to run the command in a different process group, and the easiest way of doing that is to use job control:
您需要在不同的进程组中运行该命令，最简单的方法是使用作业控制：
#!/bin/bash
# Enable job control
set -m
while :
do
read -t 10 -p "input> " input
[[ $input == finish ]] && break
# set SIGINT to default action
trap - SIGINT
# Run the command in background
bash -c "$input" &
# Set our signal mask to ignore SIGINT
trap "" SIGINT
# Move the command back-into foreground
fg %-
done
