如何增强从多个 CSV 文件中查找的脚本

Question

我需要增强下面的脚本，它需要一个包含近百万行的输入文件。针对每一行，它在 3 个查找文件中具有不同的值，我打算将其作为逗号分隔值添加到我的输出中。

下面的脚本工作正常，但需要几个小时才能完成。我正在寻找一个真正快速的解决方案，它对系统的负担也不那么大。

#!/bin/bash
while read -r ONT
do
{

ONSTATUS=$(grep "$ONT," lookupfile1.csv | cut -d" " -f2)
CID=$(grep "$ONT." lookupfile3.csv | head -1 | cut -d, -f2)
line1=$(grep "$ONT.C2.P1," lookupfile2.csv | head -1 | cut -d"," -f2,7 | sed 's/ //')
line2=$(grep "$ONT.C2.P2," lookupfile2.csv | head -1 | cut -d"," -f2,7 | sed 's/ //')
echo "$ONT,$ONSTATUS,$CID,$line1,$line2" >> BUwithPO.csv
} & 
done < inputfile.csv

inputfile.csv 包含如下所示的行：

343OL5:LT1.PN1.ONT1
343OL5:LT1.PN1.ONT10
225OL0:LT1.PN1.ONT34
225OL0:LT1.PN1.ONT39
343OL5:LT1.PN1.ONT100
225OL0:LT1.PN1.ONT57

lookupfile1.csv 包含：

343OL5:LT1.PN1.ONT100, Down,Locked,No
225OL0:LT1.PN1.ONT57, Up,Unlocked,Yes
343OL5:LT1.PN1.ONT1, Down,Unlocked,No
225OL0:LT1.PN1.ONT34, Up,Unlocked,Yes
225OL0:LT1.PN1.ONT39, Up,Unlocked,Yes

lookupfile2.csv 包含：

225OL0:LT1.PN1.ONT34.C2.P1, +123125302766,REG,DigitMap,Unlocked,_media_BNT,FD_BSFU.xml,
225OL0:LT1.PN1.ONT57.C2.P1, +123125334019,REG,DigitMap,Unlocked,_media_BNT,FD_BSFU.xml,
225OL0:LT1.PN1.ONT57.C2.P2, +123125334819,REG,DigitMap,Unlocked,_media_BNT,FD_BSFU.xml,
343OL5:LT1.PN1.ONT100.C2.P11, +123128994019,REG,DigitMap,Unlocked,_media_ANT,FD_BSFU.xml,

lookupfile3.csv 包含：

343OL5:LT1.PON1.ONT100.SERV1,12-654-0330
343OL5:LT1.PON1.ONT100.C1.P1,12-654-0330
343OL5:LT7.PON8.ONT75.SERV1,12-664-1186
225OL0:LT1.PN1.ONT34.C1.P1.FLOW1,12-530-2766
225OL0:LT1.PN1.ONT57.C1.P1.FLOW1,12-533-4019

输出是：

225OL0:LT1.PN1.ONT57, Up,Unlocked,Yes,12-533-4019,+123125334019,FD_BSFU.xml,+123125334819,FD_BSFU.xml
225OL0:LT1.PN1.ONT34, Up,Unlocked,Yes,12-530-2766,+123125302766,FD_BSFU.xml,
343OL5:LT1.PN1.ONT1, Down,Unlocked,No,,,
343OL5:LT1.PN1.ONT100, Down,Locked,No,,,
343OL5:LT1.PN1.ONT10,,,,
225OL0:LT1.PN1.ONT39, Up,Unlocked,Yes,,,

Answer 1

如您所见，瓶颈将在循环内多次执行 grep。您可以通过使用关联数组创建查找 table 来提高效率。
如果 awk 可用，请尝试以下操作：

[更新]

#!/bin/bash

awk '
FILENAME=="lookupfile1.csv" {
    sub(",$", "", );
    onstatus[] = 
}
FILENAME=="lookupfile2.csv" {
    split(, a, ",")
    if (sub("\.C2\.P1,$", "", )) line1[] = a[1]","a[6]
    else if (sub("\.C2\.P2,$", "", )) line2[] = a[1]","a[6]
}
FILENAME=="lookupfile3.csv" {
    split([=10=], a, ",")
    if (match(a[1], ".+\.ONT[0-9]+")) {
        ont = substr(a[1], RSTART, RLENGTH)
        cid[ont] = a[2]
    }
}
FILENAME=="inputfile.csv" {
    print [=10=]","onstatus[[=10=]]","cid[[=10=]]","line1[[=10=]]","line2[[=10=]]
}
' lookupfile1.csv lookupfile2.csv lookupfile3.csv inputfile.csv > BUwithPO.csv

{编辑]

如果您需要指定文件的绝对路径，请尝试：

#!/bin/bash

awk '
FILENAME ~ /lookupfile1.csv$/ {
    sub(",$", "", );
    onstatus[] = 
}
FILENAME ~ /lookupfile2.csv$/ {
    split(, a, ",")
    if (sub("\.C2\.P1,$", "", )) line1[] = a[1]","a[6]
    else if (sub("\.C2\.P2,$", "", )) line2[] = a[1]","a[6]
}
FILENAME ~ /lookupfile3.csv$/ {
    split([=11=], a, ",")
    if (match(a[1], ".+\.ONT[0-9]+")) {
        ont = substr(a[1], RSTART, RLENGTH)
        cid[ont] = a[2]
    }
}
FILENAME ~ /inputfile.csv$/ {
    print [=11=]","onstatus[[=11=]]","cid[[=11=]]","line1[[=11=]]","line2[[=11=]]
}
' /path/to/lookupfile1.csv /path/to/lookupfile2.csv /path/to/lookupfile3.csv /path/to/inputfile.csv > /path/to/BUwithPO.csv

希望这对您有所帮助。

Answer 2

如果如您在评论中指出的那样，由于缺少GNU awk提供的gensub而无法使用@tshiono提供的解决方案，您可以替换gensub使用临时变量两次调用 sub 来完成修剪所需的后缀。

示例：

awk '
FILENAME=="lookupfile1.csv" {
    sub(",$", "", );
    onstatus[] = 
}
FILENAME=="lookupfile2.csv" {
    split(, a, ",")
    if (sub("\.C2\.P1,$", "", )) line1[] = a[1]","a[6]
    else if (sub("\.C2\.P2,$", "", )) line2[] = a[1]","a[6]
}
FILENAME=="lookupfile3.csv" {
    split([=10=], a, ",")
#     ont = gensub("(\.ONT[0-9]+).*", "\1", 1, a[1])
    sfx = a[1]
    sub(/^.*[.]ONT[^.]*/, "", sfx)
    sub(sfx, "", a[1])
#     cid[ont] = a[2]
    cid[a[1]] = a[2]
}
FILENAME=="inputfile.csv" {
    print [=10=]","onstatus[[=10=]]","cid[[=10=]]","line1[[=10=]]","line2[[=10=]]
}
' lookupfile1.csv lookupfile2.csv lookupfile3.csv inputfile.csv > BUwithPO.csv

我在与 FILENAME=="lookupfile3.csv" 相关的部分注释掉了 gensub 的使用，并使用 [=19= 两次调用 sub 替换了 gensub 表达式]（后缀）作为临时变量。

试一试，如果你能用，请告诉我。

Answer 3

Perl 解决方案

以下脚本类似于 awk 解决方案，但用 Perl 编写。将其另存为 filter.pl 并使其可执行。

#!/usr/bin/env perl

use strict;
use warnings;

my %lookup1;
my %lookup2_1;
my %lookup2_2;
my %lookup3;

while( <> ) {
    if ( $ARGV eq 'lookupfile1.csv' ) {
        # 225OL0:LT1.PN1.ONT34, Up,Unlocked,Yes
        # ^^^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^ 
        if (/^([^,]+),\s*(.*)$/) {
            $lookup1{} = ;
        }
    } elsif ( $ARGV eq 'lookupfile2.csv' ) {
        # 225OL0:LT1.PN1.ONT34.C2.P1, +123125302766,REG,DigitMap,Unlocked,_media_BNT,FD_BSFU.xml,
        # ^^^^^^^^^^^^^^^^^^^^        ^^^^^^^^^^^^^                                  ^^^^^^^^^^^ 
        if (/^(.+ONT\d+)\.C2\.P1,\s*([^,]+),(?:[^,]+,){4}([^,]+)/) {
            $lookup2_1{} = ",";
        } elsif (/^(.+ONT\d+)\.C2\.P2,\s*([^,]+),(?:[^,]+,){4}([^,]+)/) {
            $lookup2_2{} = ",";
        }
    } elsif ( $ARGV eq 'lookupfile3.csv' ) {
        # 225OL0:LT1.PN1.ONT34.C1.P1.FLOW1,12-530-2766
        # ^^^^^^^^^^^^^^^^^^^^             ^^^^^^^^^^^
        if (/^(.+ONT\d+)[^,]+,\s*(.*)$/) {
            $lookup3{} = ;
        }
    } else { # assume 'inputfile.csv'
        no warnings 'uninitialized'; # because not all keys ($_) have values in the lookup tables
        # 225OL0:LT1.PN1.ONT34
        chomp;
        print "$_,$lookup1{$_},$lookup3{$_},$lookup2_1{$_},$lookup2_2{$_}\n";        
    }
}

像这样执行：

./filter.pl lookupfile{1,2,3}.csv inputfile.csv > BUwithPO.csv

首先查找文件很重要（如 awk 解决方案，顺便说一句。）因为他们构建了四个字典（hashes 用 Perl 的说法）%lookup1、%lookup2_1 等。然后 inputfile.csv 中的值与那些字典匹配。

如何增强从多个 CSV 文件中查找的脚本

How to enhance a script for look ups from multiple CSV files

python

bash

scripting

command-line

text-processing

Perl 解决方案