命令grep的输出，并在使用它与QUOT;若＆QUOT;声明中，庆典 [英] Grep output of command and use it in "if" statement, bash

问题描述

好吧，这里是另一个有关StarMade服务器。

Okay so here's another one about the StarMade server.

previously我有这个脚本用于检测碰撞，它只会通过日志搜索：

Previously I had this script for detecting a crash, it would simply search through the logs:

#!/bin/bash
cd "$(dirname "$0")"
if ( grep "[SERVER] SERVER SHUTDOWN" log.txt.0); then
sleep 7; kill -9 $(ps -aef | grep -v grep | grep 'StarMade.jar' | awk '{print $2}')
fi

这将找到[SERVER]服务器关闭，并杀死之后的过程，但是这不是一个防水的方法，因为不同的错误，它可能是可能的消息未出现，使这个脚本也没用。

It would find "[SERVER] SERVER SHUTDOWN" and kill the process after that, however this is not a waterproof method, because with different errors it could be possible that the message doesn't appear, rendering this script useless.

所以我有这个工具，可以发送命令到服务器，但是当服务器处于崩溃状态返回EOF异常。我基本上要抓住这个命令的输出，并在if语句上面使用它，而不是目前的grep命令，以这样一种方式，它会执行时发现的grepjava.io.EOFException下面的命令

So I have this tool that can send commands to the server, but returns an EOF exception when the server is in a crashed state. I basically want to grab the output of this command, and use it in the if-statement above, instead of the current grep command, in such a way that it would execute the commands below when the grep finds "java.io.EOFException".

我可以使它的输出写入一个文件，然后从那里用grep显示它，但我不知道，是不是还有更好/更有效的方法来做到这一点？

I could make it write the output to a file and then grep it from there, but I wonder, isn't there a better/more efficient method to do this?

编辑：好了，打完了一下搜索我放在一起以下内容：

okay, so after a bit of searching I put together the following:

if ( java -jar /home/starmade/StarMade/StarNet.jar xxxxx xxxxx /chat) 2>&1 > /dev/null |grep java.io.EOFException);

这将是一个有效的if语句？我需要它在第一个命令的输出相匹配java.io.EOFException，如果它匹配，用然后（得到的那部分工作）执行一些东西。

Would this be a valid if-statement? I need it to match "java.io.EOFException" in the output of the first command, and if it matches, to execute something with "then" (got that part working).

推荐答案

不知道解决您的问题，但这一行：

Not sure to solve your problem, but this line:

ps -aef | grep -v grep | grep 'StarMade.jar' | awk '{print $2}'

可以更改

ps -aef | awk '/[S]tarMade.jar/ {print $2}'

的 [S] prevents AWK 从发现本身。

The [S] prevents awk from finding itself.

或者只是像这样获得 PID

pidof StarMade.jar

这篇关于命令grep的输出，并在使用它与QUOT;若＆QUOT;声明中，庆典的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！