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non alpha characters in sed + making it fast?

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http://www.unix.com – hello, I'm trying to write the fastest sed command possible (large files will be processed) to replace RICH with NICK in a file which looks like this (below) if the occurance of RICH is uppercase, replace with uppercase if it's lowercase, replace with lowercase SOMTHING_RICH_SOMTHING <- replace here hellorichwhatareyoudoing <- do not replace here, forms part of a word SOMTHING.RICH.SOMTHING <- replace here somthing_rich_somthing <- replace here HELLO-RICH-HELLO <- replace here I've used the find operator first to speed up execution how do I alter the sed to achieve the above r (HowTos)

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Submitted by ziyi on 10/01/2010 – Made popular on 10/01/2010

Stories similar to non alpha characters in sed + making it fast?

I'm trying to replace the specific numbers and use this command:

sed -e 's/[0-9]\{12\}/ /g' file.log

but nothing happens. As U can see this expression should replace all numeric occurrences with size of 12 digits, globally and replace it with space. I found out that the {, } symbols should be escaped - weird. It doesn't work. Please help.

I want to replace all words that contain abc , but do not contain KLM right before abc.

For example , "dasdasKLMabc" should not be changed, but "dasabc" is good to replace, I want to replace abc with rrr.

My target is to replace any word/string/Any characters in file with new word/string according to the following rules:

If numeric characters on the left side of word/string then we not replace the word If numeric characters on the right side of word/string then we not replace the word

remark - numeric means any number or [a-z] or [A-Z]

The following Example described file before , and file a

Problem while using sed 32 weeks 5 hours ago

hi Guys,

I have a rar file which consists of 10 files. each file has a space in its file name. how can i replace all spaces with _ i can replace them using sed but the thing is i need to replace using a script and not command. can anyone help me out??:confused::b:

Replacing using sed 32 weeks 1 day ago

hi Guys,

I have a rar file which consists of 10 files. each file has a space in its file name. how can i replace all spaces with _ i can replace them using sed but the thing is i need to replace using a script and not command. can anyone help me out??:confused:

I am trying to write a sed expression to detect lines similer to this:

s0:12345:respawn:/sbin/agetty -8 -s 115200 ttyS0 linux

and replace the "ttys0" with "something_else"

I do not want to detect commented out lines (beginning with #)

I can replace the whole line, but how to I just replace the substring, leaving the rest of the line intact ?

Search and replace text 2 years 36 weeks ago

Hello,

I am trying to search and replace but I don't know how to do it. My simple knowlegde in search and replace using sed is not helping me at all.

File:

Code: its a cause value #22: dfg ggg Cause value #1: aasfa fasdf asfa value #22: affg gggg Basically i want to replace the colon(:) with hash (#) while retaining the rest of the words on that line.

HI , I can't find a solution to the following:

In a simple menu script I want to capture the input from the user with "read" and use it as a value in a variable Rempages="some_value" which is in a different script file. So I have to perform a search and replace for this variable and only replace its value.

How can that be done?

The only part that bothers me is the Search and

I have many large Unicode files. I would like to replace each Unicode byte pair with a new Unicode byte pair. For example, the original file contains "C3 B9 C3 AB C3 B8 C3 B0" and I would like to replace this with "D7 A0 D7 A8 D7 9B D7 A9".