Hi all,

Im trying to remove two types of rogue characters but I can't seem to
think of the correct solution with sed. The characters Im trying to
remove are the @ and ` characters shown below

-0.1000@-0.1000

-0.1000`-0.1000

I have tried...

sed 's/@/ /' FILENAME | sed 's/`/ /'

It doesn't seem to work for all instances. Any idea would be much
appreciated

Many thanks.

On 2007-05-27, waffle.horn@googlemail.com wrote:
> Hi all,
>
> Im trying to remove two types of rogue characters but I can't seem to
> think of the correct solution with sed. The characters Im trying to
> remove are the @ and ` characters shown below
>
> -0.1000@-0.1000
>
> -0.1000`-0.1000
>
> I have tried...
>
> sed 's/@/ /' FILENAME | sed 's/`/ /'
>
> It doesn't seem to work for all instances.

Presumably, those instances are where there's more than one such
character on a line. For that you need to use global substitution
(and you can do it with a single call to sed):

sed -e 's/@/ /g' -e 's/`/ /g' FILENAME

--
Chris F.A. Johnson, author <http://cfaj.freeshell.org/shell/>
Shell Scripting Recipes: A Problem-Solution Approach (2005, Apress)
===== My code in this post, if any, assumes the POSIX locale
===== and is released under the GNU General Public Licence

On 2007-05-27, waffle.horn@googlemail.com <waffle.horn@googlemail.com> wrote:
> Hi all,
>
> Im trying to remove two types of rogue characters but I can't seem to
> think of the correct solution with sed. The characters Im trying to
> remove are the @ and ` characters shown below
>
> -0.1000@-0.1000
>
> -0.1000`-0.1000
>
> I have tried...
>
> sed 's/@/ /' FILENAME | sed 's/`/ /'

You probably weant the 'g' option to s to make the replacements
global. Without it sed will only replace the first occurance.

You also don't need to call sed twice like this. You can feed sed
more than one command at a time, or in this instance combine the
commands into one:

sed 's/[@`]/ /g' FILENAME

That will replace either a "@" or "`" with spaces like your example
above did. To actually delete them, replace the command to sed
with 's/[@`]//g'

--
Andrew Smallshaw
andrews@sdf.lonestar.org

waffle.horn@googlemail.com wrote:
>
> Im trying to remove two types of rogue characters but I can't seem to
> think of the correct solution with sed. The characters Im trying to
> remove are the @ and ` characters shown below
>
> -0.1000@-0.1000
>
> -0.1000`-0.1000
>
> I have tried...
>
> sed 's/@/ /' FILENAME | sed 's/`/ /'
>
> It doesn't seem to work for all instances. Any idea would be much
> appreciated

If you want to remove them:

tr -d '@`' < FILENAME

If you want to replace them with a space like your example shows:

tr '@`' ' ' < FILENAME



John
--
Perl isn't a toolbox, but a small machine shop where you can special-order
certain sorts of tools at low cost and in short order. -- Larry Wall

Thank you both examples seemed to do the trick. The is much
appreciated as are the explanations.

On May 27, 8:06 pm, "John W. Krahn" <some...@example.com> wrote:
> waffle.h...@googlemail.com wrote:
>
> > Im trying to remove two types of rogue characters but I can't seem to
> > think of the correct solution with sed. The characters Im trying to
> > remove are the @ and ` characters shown below
>
> > -0.1...@-0.1000
>
> > -0.1000`-0.1000
>
> > I have tried...
>
> > sed 's/@/ /' FILENAME | sed 's/`/ /'
>
> > It doesn't seem to work for all instances. Any idea would be much
> > appreciated
>
> If you want to remove them:
>
> tr -d '@`' < FILENAME
>
> If you want to replace them with a space like your example shows:
>
> tr '@`' ' ' < FILENAME
>
> John
> --
> Perl isn't a toolbox, but a small machine shop where you can special-order
> certain sorts of tools at low cost and in short order. -- Larry Wall

Thank you both examples seemed to do the trick. The is much
appreciated as are the explanations.

On May 27, 8:06 pm, "John W. Krahn" <some...@example.com> wrote:
> waffle.h...@googlemail.com wrote:
>
> > Im trying to remove two types of rogue characters but I can't seem to
> > think of the correct solution with sed. The characters Im trying to
> > remove are the @ and ` characters shown below
>
> > -0.1...@-0.1000
>
> > -0.1000`-0.1000
>
> > I have tried...
>
> > sed 's/@/ /' FILENAME | sed 's/`/ /'
>
> > It doesn't seem to work for all instances. Any idea would be much
> > appreciated
>
> If you want to remove them:
>
> tr -d '@`' < FILENAME
>
> If you want to replace them with a space like your example shows:
>
> tr '@`' ' ' < FILENAME
>
> John
> --
> Perl isn't a toolbox, but a small machine shop where you can special-order
> certain sorts of tools at low cost and in short order. -- Larry Wall