尾巴-f |一旦发现数据，awk和end tail [英] tail -f | awk and end tail once data is found

问题描述

我正在尝试构建一个脚本，该脚本tail -f | awk每秒更新一次的日志文件.根据我的搜索参数，awk部分只会获取我日志文件的必需部分.输出XML也被捕获在输出文件中.脚本运行正常-符合预期.

I am trying to build a script which tail -f | awk the log file which is getting updated every second. awk part will fetch me only the required part of the log file based on my search parameter. Output XML is also captured in an output file. Script is working fine - as expected.

问题-但是，执行搜索后，由于tail -f，它始终保持挂起状态.任何想法如何在脚本下面进行更新-以便一旦捕获了输出XML，就应该破坏其尾部??

Issue - However ever after the search is performed it stays hung due to tail -f. Any idea how to update below script - so that once the output XML is captured, it should break the tail part??

XMLF=/appl/logs/abc.log

aa_pam=${1-xml}
[[ ${2-xml} = "xml" ]] && tof=xml_$(date +%Y%m%d%H%M%S).xml || tof=$2
tail -f $XMLF | \
awk  ' BEGIN { Print_SW=0; Cnt_line=1; i=0}
       /\<\?xml version\=/ { if (Print_SW==1) p_out(Cnt_Line,i)
                             Print_SW=0; Cnt_line=1;
       }
       { Trap_arry[Cnt_line++]=$0;
       }
       /'${1-xml}'/ { Print_SW=1;
       }
       /\<\/XYZ_999/    { if (Print_SW==1) p_out(Cnt_Line, i);
                             Print_SW=0; Cnt_line=1; }
       END { if (Print_SW==1) p_out(Cnt_Line, i); }
function p_out(Cnt_Line, i) {
       for (i=1;i<Cnt_line;i++) {print Trap_arry[i] | "tee '$tof'" }
}
' | tee $tof

更新 按照以下使用exit的建议进行尝试-成功存在该脚本-但是在输出处捕获的xml被复制.因此，在输出文件中-相同的XML出现了两次.

Update Tried as per below suggestion of using exit - it is existing the script successfully - however the xml that is getting captured at output is getting duplicated. So in the output file - same XML appears twice..!!

XMLF=/appl/logs/abc.log

aa_pam=${1-xml}
[[ ${2-xml} = "xml" ]] && tof=xml_$(date +%Y%m%d%H%M%S).xml || tof=$2
tail -f $XMLF | \
awk  ' BEGIN { Print_SW=0; Cnt_line=1; i=0}
       /\<\?xml version\=/ { if (Print_SW==1) p_out(Cnt_Line,i)
                             Print_SW=0; Cnt_line=1;
       }
       { Trap_arry[Cnt_line++]=$0;
       }
       /'${1-xml}'/ { Print_SW=1;
       }
       /\<\/XYZ_999/    { if (Print_SW==1) p_out(Cnt_Line, i);
                             Print_SW=0; Cnt_line=1; }
       END { if (Print_SW==1) p_out(Cnt_Line, i); }
function p_out(Cnt_Line, i) {
       for (i=1;i<Cnt_line;i++) {print Trap_arry[i] | "tee '$tof'" } { exit }
}
' | tee $tof

推荐答案

基于此问题

其中t.awk是:

/<\?xml version\=/ {
    if (Print_SW==1) {
        p_out(Cnt_Line)
    }
    Print_SW=0
    Cnt_line=0
}

{
    Trap_arry[++Cnt_line]=$0
}

$0 ~ par1 {
    Print_SW=1;
}

/<\/XYZ_999/    {
    if (Print_SW==1)
        p_out(Cnt_Line)
    Print_SW=0
    Cnt_line=0
}

function p_out(Cnt_Line, i) {
    for (i=1; i<Cnt_line; i++) {
        print Trap_arry[i] | ("tee " tof)
    }
    exit 1
}

这篇关于尾巴-f |一旦发现数据，awk和end tail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！