24、深入探索Bash脚本的高级特性

深入探索Bash脚本的高级特性

1. 捕获中断信号

在Bash脚本中， trap 命令可用于捕获特定信号并执行相应操作。例如：

trap "trapped INT"  INT
trap "trapped KILL" KILL   # This won't actually work
trap "trapped QUIT" QUIT
trap "trapped TERM" TERM
trap "trapped USR1" USR1   # This one is special
# Just hang out and do nothing, without introducing "third-party"
# trap behavior, such as if we used 'sleep'
while (( 1 )); do
    :  # : is a NOOP
done

当我们运行这个脚本并尝试终止它时，会发现部分信号被成功捕获：

$ ./hard_to_kill
^CReceived INT trap--neener, neener
^CReceived INT trap--neener, neener
^CReceived INT trap--neener, neener
^Z
[1]+ Stopped                  ./hard_to_kill
$ kill -TERM %1
[1]+ Stopped                  ./hard_to_