BASH如何在脚本结束时执行命令？

Question

我有一个bash脚本，基本上充当驱动程序。由于某些原因，Ubuntu不能自行分配蓝牙串口。该脚本的功能是连接蓝牙设备，然后将其分配到/dev/bluetooth串口中以便访问。最后，当设备断开连接或通过按“q”终止时，它会关闭端口。

我想知道是否有一种方法在执行ctrl-C时在bash脚本中执行命令，以便不会在我的/dev文件夹中留下无法使用的设备。

- Adam Outler

Answer 1

没错，你可以使用'trap'命令。按下CTRL-C会发送SIGINT信号，因此我们可以使用trap来捕获它:

#!/bin/bash

trap "echo hello world" INT

sleep 10

如果你在程序运行时按下 CTRL-C，它将会执��命令 (echo hello world) :-)

- Chris J

---

可以在循环中使用吗？例如：做某事直到按下Ctrl+c。 - QkiZ

Answer 2

 $ help trap

 trap: trap [-lp] [arg signal_spec ...]
     The command ARG is to be read and executed when the shell receives
     signal(s) SIGNAL_SPEC.  If ARG is absent (and a single SIGNAL_SPEC
     is supplied) or `-', each specified signal is reset to its original
     value.  If ARG is the null string each SIGNAL_SPEC is ignored by the
     shell and by the commands it invokes.  If a SIGNAL_SPEC is EXIT (0)
     the command ARG is executed on exit from the shell.  If a SIGNAL_SPEC
     is DEBUG, ARG is executed after every simple command.  If the`-p' option
     is supplied then the trap commands associated with each SIGNAL_SPEC are
     displayed.  If no arguments are supplied or if only `-p' is given, trap
     prints the list of commands associated with each signal.  Each SIGNAL_SPEC
     is either a signal name in <signal.h> or a signal number.  Signal names
     are case insensitive and the SIG prefix is optional.  `trap -l' prints
     a list of signal names and their corresponding numbers.  Note that a
     signal can be sent to the shell with "kill -signal $$".

- Logan Capaldo

Answer 3

使用一个陷阱。

trap "do_something" SIGINT

其中，“do_something”是一个命令或函数名称。

- Dennis Williamson