阅读日志bash脚本时出错

我遇到了一个我正在写的bash脚本的问题。我想读取一个日志文件并对输出做些什么。但问题是它每次都会记录两行而不是一行。所以每次我得到一份输出而不是一行。阅读日志bash脚本时出错

#!/bin/bash 
############## 

logfile=/var/atlassian/application-data/jira/log/atlassian-ing-security.log 
counter_a=0 
counter_b=0 

tail -fn0 /var/atlassian/application-data/jira/log/atlassian-jira- security.log | \ 
while read line ; do 
    echo "$line" | grep "FAILED" 
    if [ $? = 0 ] 
    then 
     echo "API action FAILED" >> $logfile 
     counter_a=$((counter_a+1)) 
     echo "Total of $counter_a API actions FAILED" >> $logfile 
    else 
     echo "API action SUCCESFULL" >> $logfile 
     counter_b=$((counter_b+1)) 
     echo "Total of $counter_b API actions SUCCESFULL" >> $logfile 
    fi 
done

这是我使用的脚本输出：

2016-07-05 20:11:28,335 http-bio-8080-exec-2917 anonymous 1211x943864x1 - 10.000.000.113,10.000.105.000 /rest/api/2/search HttpSession created [10n1nec] 
2016-07-05 20:11:28,381 http-bio-8080-exec-2917 AABBCC 1211x943864x1 - 10.000.000.000,10.000.105.000 /rest/api/2/search The user 'AABBCC' has PASSED authentication.

如何删除每次在脚本的第二行？

谢谢！

来源

2016-07-05 Danny van den Berg

问题是，grep的输出也会转到脚本的标准输出。你可以简单地压制它：

if echo "$line" | grep -q FAILED; then 
    echo "API action FAILED" >> $logfile 
    counter_a=$((counter_a+1)) 
    echo "Total of $counter_a API actions FAILED" >> $logfile 
else 
    echo "API action SUCCESFULL" >> $logfile 
    counter_b=$((counter_b+1)) 
    echo "Total of $counter_b API actions SUCCESFULL" >> $logfile 
fi

然而，更好的方法是避免在每一行（相对）昂贵的呼叫grep和使用shell本身来检测匹配。

tail ... | { 
    while read line ; do 
    if [[ $line = *FAILED* ]]; then 
    then 
     echo "API action FAILED" 
     counter_a=$((counter_a+1)) 
    else 
     echo "API action SUCCESSFUL" 
     counter_b=$((counter_b+1)) 
    fi 
    done 
    # You probably want to execute these just once, after the entire 
    # file has been processed. 
    echo "Total of $counter_b API actions SUCCESSFUL" 
    echo "Total of $counter_a API actions FAILED" 
} >> "$logfile"

来源

2016-07-05 18:24:14 chepner

谢谢。唯一的问题是脚本必须连续运行而不是一次扫描。所以每次有人执行api时，脚本都必须将其记录到外部文件中。 –

如果您确实需要在每行之后记录一次运行计数，则可以从我显示的第一个片段中保留该部分，然后使用'[[...]]'命令替换'grep'管道。 – chepner

令人遗憾的是，它保持记录两行而不是一行..我不明白它，因为它的第一行没有任何创建的语法.... –

阅读日志bash脚本时出错

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