hi all

I have an file:
980<tab>980
981 981
982 982
983 983
984 984
985 985
986 986
987 987
988 988
989 989
990 990
991 991
992 992
993 993
994 994



I hope I can using "^99\d" to list 99x
or using "^992\t" to list "992"

but that don't work , why?

I have tried using [\d]... , no use.

thank you very much
key9

On 2006-12-02, key9 wrote:
> hi all
>
> I have an file:
> 980<tab>980
> 981 981
> 982 982
> 983 983
> 984 984
> 985 985
> 986 986
> 987 987
> 988 988
> 989 989
> 990 990
> 991 991
> 992 992
> 993 993
> 994 994
>
>
>
> I hope I can using "^99\d" to list 99x
> or using "^992\t" to list "992"
>
> but that don't work , why?
>
> I have tried using [\d]... , no use.

grep '^99[0-9]'

grep '^992'

--
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

> grep '^992'


this will also list 9920


take a look at this
format is

int<tab>string

70 xxx
74 xxx
75 xxx
750 anc
7500 bcd


I want show 7x line

whe I using '^7[0-9]'

it will also list 750 7500
but \t will not work : '^7[0-9]\t'

Hello,

> > grep '^992'
>
>
> this will also list 9920
>
>
> take a look at this
> format is
>
> int<tab>string
>
> 70 xxx
> 74 xxx
> 75 xxx
> 750 anc
> 7500 bcd
>
>
> I want show 7x line
>
> whe I using '^7[0-9]'
>
> it will also list 750 7500
> but \t will not work : '^7[0-9]\t'

Use "\s" to specify that there is a "space character" after your 7x
pattern:
grep '^7[0-9]\s'

HTH,
Loic.

"key9" <iamkey9@126.com> writes:

> take a look at this
> format is
>
> int<tab>string
>
> 70 xxx
> 74 xxx
> 75 xxx
> 750 anc
> 7500 bcd
>
> I want show 7x line

grep '^7[0-9][[:space:]]'

--
Best regards, _ _
.o. | Liege of Serenly Enlightened Majesty of o' \,=./ `o
..o | Computer Science, Michal "mina86" Nazarewicz (o o)
ooo +--<mina86*tlen.pl>---<jid:mina86*chrome.pl>--ooO--(_)--Ooo--

> grep '^7[0-9]\s'

ok it works

but I wanna know why '^7[0-9]\t' not work?

Actually I generated this file using c++

std::cout << int << "\t" << string_ << std::endl;

and I using some hex editor exam the file , the "blank" is <tab> :-)

Dose \s means "human readable blank?"

Hold on

it'still not work:
cat file > grep '^12\s'



using this code to generate file,we named the bin gener

#include <iostream>
#include <string>

using namespace c++

int main()
{
int la = 0;
int ua = 2000;
for(int i = la; i != ua; ++i){

cout << i << "\t" << i << endl;

}

}



gener > file
cat file > grep '^12\s'

I suppose it will display
12 12

but it display nothing

> using namespace c++
sorry
using namespace std;

2006-12-2, 19:18(+08), key9:
> Hold on
>
> it'still not work:
> cat file > grep '^12\s'
[...]

That command will concatenate the content of the "file" and
"^12\s" files and store that in a file called "grep" in the
current directory.

grep '^12[[:blank:]]' < file

TAB=`printf '\t'`
grep "^12$TAB"

standard greps don't necessarily recognise any of those \s, \t,
\d...

awk recognises \t:

awk '/^12\t/'


--
Stéphane

key9 wrote:
>>grep '^992'
>
> this will also list 9920
>
> take a look at this
> format is
>
> int<tab>string
>
> 70 xxx
> 74 xxx
> 75 xxx
> 750 anc
> 7500 bcd
>
> I want show 7x line
>
> whe I using '^7[0-9]'
>
> it will also list 750 7500
> but \t will not work : '^7[0-9]\t'

Try any of...

grep '^7[0-9]\>'

grep -w '^7[0-9]'

grep '^7[0-9][ ]' # there's a space and a tab inside the []


Janis

Hi,

> Hold on
>
> it'still not work:
> cat file > grep '^12\s'

Of course, it doesn't work! Your last command should read:
$ cat file | grep '^12\s'

or even better:
$ grep '^12\s' file

the \s means "white space" which expands to something like:
[ \f\n\r\t\v]

Cheers,
Loic.

2006-12-2, 14:44(-08), loic-dev@gmx.net:
> Hi,
>
>> Hold on
>>
>> it'still not work:
>> cat file > grep '^12\s'
>
> Of course, it doesn't work! Your last command should read:
> $ cat file | grep '^12\s'
>
> or even better:
> $ grep '^12\s' file
>
> the \s means "white space" which expands to something like:
> [ \f\n\r\t\v]
[...]

In which version of grep is \s such a thing? Even GNU grep
doesn't seem to recognise \s.

\s is a blank (that is [ \t]) in perl (and perl compatible
regular expressions) and vim, that I know of.

GNU grep can be compile with PCRE support in which case you can
do: grep -P '^12\s' (still for [ \t]).

You could do:

perl -lne 'print if /^12\s/'

standard greps have [[:blank:]] for blank ([ \t]) and
[[:space:]] for space ([ \f\n\r\t\v]).

--
Stéphane

2006-12-3, 00:28(+00), Stephane CHAZELAS:
> 2006-12-2, 14:44(-08), loic-dev@gmx.net:
>> Hi,
>>
>>> Hold on
>>>
>>> it'still not work:
>>> cat file > grep '^12\s'
>>
>> Of course, it doesn't work! Your last command should read:
>> $ cat file | grep '^12\s'
>>
>> or even better:
>> $ grep '^12\s' file
>>
>> the \s means "white space" which expands to something like:
>> [ \f\n\r\t\v]
> [...]
>
> In which version of grep is \s such a thing? Even GNU grep
> doesn't seem to recognise \s.
>
> \s is a blank (that is [ \t]) in perl (and perl compatible
> regular expressions) and vim, that I know of.
[...]

My bad, \s is space ([ \f\n\r\t\v]) in perl/pcre and tcl (in
newer versions, inspired from perl), and blank ([ \t]) in vim.

>
> GNU grep can be compile with PCRE support in which case you can
> do: grep -P '^12\s' (still for [ \t]).

Would be [ \f\n\r\t\v] then.


--
Stéphane

Stephane CHAZELAS wrote:
> 2006-12-3, 00:28(+00), Stephane CHAZELAS:
>>2006-12-2, 14:44(-08), loic-dev@gmx.net:
>>
>>In which version of grep is \s such a thing? Even GNU grep
>>doesn't seem to recognise \s.
>>
>>\s is a blank (that is [ \t]) in perl (and perl compatible
>>regular expressions) and vim, that I know of.
> [...]
>
> My bad, \s is space ([ \f\n\r\t\v]) in perl/pcre and tcl (in
> newer versions, inspired from perl), and blank ([ \t]) in vim.

Perl doesn't have a "\v" character so \s is [ \f\n\r\t]. If you want the
vertical tab included then use [[:space:]].


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