请教一个shell脚本。

[费升格]

最近一直在研究服务器。接触了很多。
不过 我开启的java程序经常会有内存泄漏。所以，我想要一个脚本来定时重启。
不过有一个难题。
1.我是通过screen 来建立一个后台java程序。 运行后，输入框会成为该java程序。就是说，只能输入java程序的命令。
2.如果我直接重启的话，后台运行着的java会因为没有保存，会导致数据丢失。
所以问题是。。。。
如果在脚本执行重启命令前，脚本可否在 该java程序输入 stop 命令？。。。
这点就像win下，我用按键精灵之类，录制好过程。再将该脚本添加上计划任务，就可以实现定时 保存重启了。

[tusooa]

信号处理嘛。

代码： 全选

● bash -c 'help trap'
trap: trap [-lp] [[arg] signal_spec ...]
    Trap signals and other events.
    
    Defines and activates handlers to be run when the shell receives signals
    or other conditions.
    
    ARG is a command to be read and executed when the shell receives the
    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) ARG is executed on exit from the shell.  If
    a SIGNAL_SPEC is DEBUG, ARG is executed before every simple command.  If
    a SIGNAL_SPEC is RETURN, ARG is executed each time a shell function or a
    script run by the . or source builtins finishes executing.  A SIGNAL_SPEC
    of ERR means to execute ARG each time a command's failure would cause the
    shell to exit when the -e option is enabled.
    
    If no arguments are supplied, trap prints the list of commands associated
    with each signal.
    
    Options:
      -l      print a list of signal names and their corresponding numbers
      -p      display the trap commands associated with each SIGNAL_SPEC
    
    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.  A
    signal may be sent to the shell with "kill -signal $$".
    
    Exit Status:
    Returns success unless a SIGSPEC is invalid or an invalid option is given.

bash是这样。不会java。应该也类似。最好用perl.