On 21:27 14 Jan 2003, Bret Hughes <[EMAIL PROTECTED]> wrote:
| On Tue, 2003-01-14 at 20:50, Cameron Simpson wrote:
| > It separates selection from operation. It says, "globally, for all lines
| > containing abdfggg, substitute that (// being 'that') with opsmsdd".
| >
| > You can do more flexible things, like:
| >
| > g/foo/ .-2,.+2m0
| > or
| > g/bah/ s/this/that/g
| >
|
| If I understand correctly, your last example says for the entire file
| look for lines that have bah, and if they do, subsitute all occurances
| of this with that
Exactly so.
| Am I close? this is more flexible than trying to build a regex that
| would do the same thing in the syntax I have used in the past. I never
| have sucessfully atomized letter combinations so I can use ? as a
| conditional. At least I don't think I have but I remember trying.
|
| I remember trying something like (from memory only)
|
| %s/({bah.*}?)(this)({.*bah}?)/$1that$3/g
That'd do every line because the "...bah...?" is optional, so even lines with
no bah will match.
| the g/foo/ one I am going to have to read up on before beginning to ask
| a question about it :)
Thinks of it like a pre-grep for the target lines.
Of course, that's what grep comes from you know:
g/re/p
where "re" means regular expression. So it came straight out of ed.
Cheers,
--
Cameron Simpson, DoD#743 [EMAIL PROTECTED] http://www.zip.com.au/~cs/
That said, I'm inclined to agree that that's not necessarily a good
idea. I always wanted to write a little program that would pop up a
Mac window to ask ``I'm going to amputate a limb at random from you
now.'' to see how many people would instinctively click "OK".
- Marc VanHeyningen <[EMAIL PROTECTED]>
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