Question

我有一个bash脚本，基本上是一个驱动程序。出于某种原因，Ubuntu无法自行分配蓝牙串口。该脚本的功能是连接蓝牙设备，然后在/ dev / bluetooth serial中为其分配一个位置。最后，当设备断开连接或按“q”终止时，它会终止端口。

我想知道在执行ctrl-C时是否有某种方法可以在bash脚本中执行命令，这样它就不会将不可用的设备留在我的/ dev文件夹中

Answer 1

是的，你可以使用'trap'命令。按CTRL-C发送一个SIGINT，所以我们可以使用trap来捕获：

#!/bin/bash

trap "echo hello world" INT

sleep 10

如果在运行时按CTRL-C，它将执行命令（echo hello world）： - ）

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 $$".

Answer 3

使用陷阱。

trap "do_something" SIGINT

其中“do_something”是命令或函数名称。

BASH如何在脚本终止时执行命令？

3 个答案: