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insert text to beginning of each word
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brumik
May 29, 2012, 5:16:31 PM5/29/12
to
I am trying to insert 2 characters followed by a space specifially "-D
" to the beginning of each word in a string and also to include the
first word in the string.
e..g have the strings separated by spaces:
"rpool/root rpool/var rpool/test"
I want to pipe this through sed to produce:
"-D rpool/root -D rpool/var -D rpool/test"
Could someone help how to do this please? How can I match each word
and insert -D in front of it.
Thanks in advance.
Chris F.A. Johnson
May 29, 2012, 6:22:48 PM5/29/12
to
str="rpool/root rpool/var rpool/test"
printf "%s\n" "$str" | sed 's/ / -D /g'
Or, with bash or ksh93:
printf "%s\n" "${str// / -D }"
--
Chris F.A. Johnson, author <http://shell.cfajohnson.com/>
===================================================================
Shell Scripting Recipes: A Problem-Solution Approach (2005, Apress)
Pro Bash Programming: Scripting the GNU/Linux Shell (2009, Apress)
Janis Papanagnou
May 29, 2012, 11:24:25 PM5/29/12
to
Am 30.05.2012 00:16, schrieb brumik:
>
> I am trying to insert 2 characters followed by a space specifially "-D
> " to the beginning of each word in a string and also to include the
> first word in the string.
>
> e..g have the strings separated by spaces:
>
> "rpool/root rpool/var rpool/test"
>
> I want to pipe this through sed to produce:
Why sed?
>
> I am trying to insert 2 characters followed by a space specifially "-D
> " to the beginning of each word in a string and also to include the
> first word in the string.
>
> e..g have the strings separated by spaces:
>
> "rpool/root rpool/var rpool/test"
>
> I want to pipe this through sed to produce:
>
> "-D rpool/root -D rpool/var -D rpool/test"
>
> Could someone help how to do this please? How can I match each word
> and insert -D in front of it.
Janis
>
> Thanks in advance.
Stephane Chazelas
May 30, 2012, 8:00:24 AM5/30/12
to
2012-05-29 14:16:31 -0700, brumik:
[...]
s/[^[:blank:]]\{1,\}/-D &/g
--
Stephane
s/[^[:blank:]]\{1,\}/-D &/g
--
Stephane
romy
Jun 9, 2012, 2:42:14 PM6/9/12
to
try this -
cat text.file |sed "s/ / -D /g"
cat text.file |sed "s/ / -D /g"
Ed Morton
Jun 12, 2012, 9:41:03 AM6/12/12
to
Could you explain why using "cat" and a pipe as above is better than having
sed open the file:
sed "s/ / -D /g" text.file
Regards,
Ed.
Posted using www.webuse.net
sed open the file:
sed "s/ / -D /g" text.file
Regards,
Ed.
Posted using www.webuse.net
Manuel Collado
Jun 12, 2012, 11:42:52 AM6/12/12
to
El 12/06/2012 15:41, Ed Morton escribi�:
> Regards,
> Ed.
I know you know it, just mentioned for the benefit of other readers.
Regards,
--
Manuel Collado - http://lml.ls.fi.upm.es/~mcollado
> romy<rav...@gmail.com> wrote:
>
>> try this -
>>
>> cat text.file |sed "s/ / -D /g"
>
> Could you explain why using "cat" and a pipe as above is better than having
> sed open the file:
>
> sed "s/ / -D /g" text.file
>
That practice is so frequent that has a name: UUOC
>
>> try this -
>>
>> cat text.file |sed "s/ / -D /g"
>
> Could you explain why using "cat" and a pipe as above is better than having
> sed open the file:
>
> sed "s/ / -D /g" text.file
>
> Regards,
> Ed.
I know you know it, just mentioned for the benefit of other readers.
Regards,
--
Manuel Collado - http://lml.ls.fi.upm.es/~mcollado
Ed Morton
Jun 12, 2012, 3:01:47 PM6/12/12
to
Manuel Collado <m.co...@domain.invalid> wrote:
> El 12/06/2012 15:41, Ed Morton escribiￜ:
explain the usefulness of the "cat" so they thought about it themselves and came
to the right conclusion rather than just telling them up front that it was
useless. Perhaps this was a UUOP (Useless Use Of Posting) though. :-( .
Ed.
Posted using www.webuse.net
> El 12/06/2012 15:41, Ed Morton escribiￜ:
> > romy<rav...@gmail.com> wrote:
> >
> >> try this -
> >>
> >> cat text.file |sed "s/ / -D /g"
> >
> > Could you explain why using "cat" and a pipe as above is better than having
> > sed open the file:
> >
> > sed "s/ / -D /g" text.file
> >
>
> That practice is so frequent that has a name: UUOC
Yeah, I just thought maybe it'd have more lasting impact if we asked posters to
> >
> >> try this -
> >>
> >> cat text.file |sed "s/ / -D /g"
> >
> > Could you explain why using "cat" and a pipe as above is better than having
> > sed open the file:
> >
> > sed "s/ / -D /g" text.file
> >
>
> That practice is so frequent that has a name: UUOC
explain the usefulness of the "cat" so they thought about it themselves and came
to the right conclusion rather than just telling them up front that it was
useless. Perhaps this was a UUOP (Useless Use Of Posting) though. :-( .
Ed.
Posted using www.webuse.net
Janis Papanagnou
Jun 12, 2012, 3:37:10 PM6/12/12
to
On 12.06.2012 21:01, Ed Morton wrote:
> Manuel Collado <m.co...@domain.invalid> wrote:
>
[...]
Nonetheless we can observe that there are still "please help me to do better"
requests, and after some better suggestions, a "I prefer to continue doing it
the bad way" responses. - Now that is a waste of time! - if we only knew that
in advance. *sigh*
Janis
>
> Ed.
>
> Posted using www.webuse.net
> Manuel Collado <m.co...@domain.invalid> wrote:
>
[...]
>>
>> That practice is so frequent that has a name: UUOC
>
> Yeah, I just thought maybe it'd have more lasting impact if we asked posters to
> explain the usefulness of the "cat" so they thought about it themselves and came
> to the right conclusion rather than just telling them up front that it was
> useless. Perhaps this was a UUOP (Useless Use Of Posting) though. :-( .
No, it wasn't a UUOP; I think your approach is completely right!
>> That practice is so frequent that has a name: UUOC
>
> Yeah, I just thought maybe it'd have more lasting impact if we asked posters to
> explain the usefulness of the "cat" so they thought about it themselves and came
> to the right conclusion rather than just telling them up front that it was
> useless. Perhaps this was a UUOP (Useless Use Of Posting) though. :-( .
Nonetheless we can observe that there are still "please help me to do better"
requests, and after some better suggestions, a "I prefer to continue doing it
the bad way" responses. - Now that is a waste of time! - if we only knew that
in advance. *sigh*
Janis
>
> Ed.
>
> Posted using www.webuse.net
Manuel Collado
Jun 13, 2012, 5:38:18 AM6/13/12
to
El 12/06/2012 21:01, Ed Morton escribiￜ:
Well, my intention wasn't to explicitly tell that the above use of cat
if useless. Just mention a usual acronym for that practice, without
expanding it. In the hope that the OP will be intrigued by the acronym
and search the net for its meaning.
So I was just trying to reinforce your intention.
if useless. Just mention a usual acronym for that practice, without
expanding it. In the hope that the OP will be intrigued by the acronym
and search the net for its meaning.
So I was just trying to reinforce your intention.
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