Linux通过索引替换命令 [英] Linux replacement command by index

问题描述

卡住。非常困难。

为什么？因为我无法通过给出索引来找出替代命令



我现在正在做的是：

 rploldstringnewstringfilename

ofcourse这会改变所有搜索结果。



我需要的是这样的：

 rplindexnewstringfilename

或

 rplindexoldstringnewstringfilename

我发现但对我不起作用的是：

 sed'35s /.*/ foo /'$ filename 

其中35是行号

和foo是我要用

^ - 有效，但我似乎无法弄清楚如何建立自己的字符串，

我试过：

 sed'$ {index} s /.*/$ {replacementline}'$ filename 

注意：这条线我是尝试更改文件几次。 （我正在尝试使用索引来解决这个问题，这导致了当前的问题）

我现在已经做了很长时间了......而且我是linux的命令的新手，我自己还没有完成复杂命令的经验。



感谢您帮助^^！

解决方案

filename

其中35是行号

和foo是我要替换旧行的字符串

^ - 工作但我不能似乎弄清楚如何建立我自己的字符串，

我试过：

 sed'

{索引}Š/.*/

{replacementline}

stuck. very stuck.
why? because i can't figure out a replacement command that works by giving an index

what i'm doing now is:

rpl "oldstring" "newstring" "filename"

ofcourse this changes all the search results.

what i need is something like this:

rpl "index" "newstring" "filename"

or

rpl "index" "oldstring" "newstring" "filename"

what i've found but doesn't work for me is:

sed '35s/.*/foo/' $filename

where 35 is the line number
and foo is the string that i want to replace the old line with
^-- works but i can't seem to figure out how to build my own string,
i've tried :

sed '${index}s/.*/${replacementline}' $filename

note: the line i'm trying to change in the file occurs several times. (i'm trying to work with an index to fix this problem, wich caused the current problem)
i've been working on this long enough now.. and i'm new to linux's commands, i haven't got the experience yet to make complex commands myself.

thanks for helping ^^!

解决方案

filename

where 35 is the line number
and foo is the string that i want to replace the old line with
^-- works but i can't seem to figure out how to build my own string,
i've tried :

sed '

{index}s/.*/

{replacementline}'

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