Re: bash command

[Darac Marjal <mailinglist@darac.org.uk>]

On Thu, Oct 20, 2011 at 09:36:50AM +0100, Raf Czlonka wrote:
> On Thu, Oct 20, 2011 at 09:29:35AM BST, Jesus arteche wrote:
> > I want to create  a script to change some words in some sonf files at the
> > start up of the system...do you know the command in bash for search the word
> > and replace it??
> 
> You don't need bash for it, sed's your friend, e.g.:
> 
> % sed -i 's/old_word/new_word/' /etc/conf.file

Proving that TIMTOWTDI (or, "You don't need sed for it, bash's your
friend):

    while read line; do
	   echo ${line/old_word/new_word}
	done < /etc/conf.file > /etc/conf.file.new

Sadly, this can't be done in-place, so you'll either need to use mv to
replace /etc/conf.file with /etc/conf.file.new or repeat the loop (with
no substitution) to copy /etc/conf.file.new into /etc/conf.file.

By the way, I don't recommend this method. sed IS your friend, but bash
IS capable and that's what you asked for :)

-- 
Darac Marjal