[CentOS] replacing a line in a file

fred smith fredex at fcshome.stoneham.ma.us
Sun Jan 25 03:21:37 UTC 2009

On Sat, Jan 24, 2009 at 10:01:56PM -0500, Jerry Geis wrote:
> I have a large file that has a line like:
> bindaddr=     ; some other text
> I want to replace the with my address and remove 
> everything
> else on the line to get:
> bindaddr=
> How can I do that?

given the power of unix/linux, there's probably a bazillion ways.
If you want to do it from the commandline without having to use an
interactive text editor, you could do it this way (note this is UNTESTED):

	sed -e "s/^bindaddr=0\.0\.0\.0.*$/bindaddr=192\.168\.1\.8/" filename

Note the backslashes to turn the dots into literal dots, not the
regexp character that it would be without the backslash. also note
the single instance of a dot without a leading backslash, because
that is intended to be a regexp.

OK, now it's tested. given this input file:

bindaddr=     ; some other text
bindaddr=     ; some other text
bindaddr=     ; some other text
bindaddr=     ; some other text

applying the command above produces:

bindaddr=     ; some other text
bindaddr=     ; some other text
bindaddr=     ; some other text

Other people would come up with something in AWK, or Perl or Ruby
or PHP or <insert language du jour here>. I suppose someone with time on
his hands might even figure out how to do it purely in BASH, without
resorting to any external programs.

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