SED找到替代使用bash阵列失败 [英] sed find replace using bash arrays fails

问题描述

我有三个文件，两个文件在每个文件2259的IP地址。一个文件与137772.脚本使用使用bash阵列sed和一个for循环来在不同的IP的access.log的更换IP地址。几个小时运行该脚本后失败，此错误：

的sed：-e前pression＃1，烧焦0：无previous定期EX pression

uniq的IP地址的数量也由六个IP的短

下面是脚本：

 ＃！/斌/庆典
_ORGIFS = $ IFS
IFS = $'\\ n'
_alIPs =（$（小于access.log.IPs）
_fIPs =（$（小于randomIPs.txt）
为（（_i = 1; _i＆下; = 2259; _i ++））
做
  SED -iS / $ {_ ALIPS [$ _ I]} / $ {_ FIPS [$ _ I]} / G的access.log
DONE
IFS = $ _ ORGIFS
 

解决方案

数组索引在bash从0开始。当你说

 为（（_i = 1; _i＆LT; = 2259; _i ++））
 

您忽略第一项，并走一过去的结束，在这一点

  SED -iS / $ {_ ALIPS [$ _ I]} / $ {_ FIPS [$ _ I]} / G的access.log
 

扩展到

  SED -iS //东西/ G的access.log
 

的 // 在取值命令尝试重用previously经常使用前pression，它不存在，所以你得到的错误。

的解决方案是使用

 为（（_ I = 0;＆_I LT; 2259; _i ++））
 

...虽然，说真的，我会花一些时间思考如何做那些替代散装。

附录：如

  SED -i -f≤（粘贴access.log.IPs randomIPs.txt | awk的'{打印S /$ 1/$ 2/ G}） access.log的
 

（假设我正确地读出你的意图）

I have three files, two files with 2259 IP addresses in each file. One file with 137772. The script uses sed with bash arrays and a for loop to replace the IPs in an access.log with different IPs. After several hours of running the script fails with this error:

sed: -e expression #1, char 0: no previous regular expression

The number of uniq IP addresses is also short by six IPs.

Here is the script:

#!/bin/bash
_ORGIFS=$IFS
IFS=$'\n'
_alIPs=($(<access.log.IPs)
_fIPs=($(<randomIPs.txt)
for (( _i=1; _i<=2259; _i++ ))
do 
  sed -i "s/${_alIPs[$_i]}/${_fIPs[$_i]}/g" access.log
done
IFS=$_ORGIFS

解决方案

Array indices in bash start at 0. When you say

for (( _i=1; _i<=2259; _i++ ))

you ignore the first entry and go one past the end, at which point

sed -i "s/${_alIPs[$_i]}/${_fIPs[$_i]}/g" access.log

expands to

sed -i "s//something/g" access.log

The // in the s command attempts to reuse the previously used regular expression, which doesn't exist, and so you get the error.

The solution is to use

for (( _i=0; _i<2259; _i++ ))

...although, seriously, I'd spend some time thinking about ways to do those replacements in bulk.

Addendum: Such as

sed -i -f <(paste access.log.IPs randomIPs.txt | awk '{ print "s/" $1 "/" $2 "/g" }') access.log

(assuming I read your intentions correctly)

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