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Computer Groups Forum Index » Editors » Geting only the numbers out...
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| SamG |
 Posted: Thu Mar 29, 2007 8:02 am |
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I need sed onliner, where is have 243xx as string in file[Thats the
only line in the file and xx could be anythin 'ab' 'a1' but cannot be
'1a'.] and i want only 243 to be return.
Could this be done using either sed or awk. |
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| RalfB |
| Posted: Thu Mar 29, 2007 8:02 am |
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On 29 Mrz., 06:38, "SamG" <mad.vi...@gmail.com> wrote:
Quote: I need sed onliner, where is have 243xx as string in file[Thats the
only line in the file and xx could be anythin 'ab' 'a1' but cannot be
'1a'.] and i want only 243 to be return.
Could this be done using either sed or awk.
sed 's/\([0-9]*\).*/\1/'
hth
Ralf |
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| SamG |
| Posted: Thu Mar 29, 2007 4:04 pm |
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RalfB wrote:
Quote: On 29 Mrz., 06:38, "SamG" <mad.vi...@gmail.com> wrote:
I need sed onliner, where is have 243xx as string in file[Thats the
only line in the file and xx could be anythin 'ab' 'a1' but cannot be
'1a'.] and i want only 243 to be return.
Could this be done using either sed or awk.
sed 's/\([0-9]*\).*/\1/'
hth
Ralf
Thanks Ralf,
I have a long way to go in sed. it looks so simple though! |
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| sjdevnull@yahoo.com |
| Posted: Thu Mar 29, 2007 4:04 pm |
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Guest
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SamG wrote:
Quote: RalfB wrote:
On 29 Mrz., 06:38, "SamG" <mad.vi...@gmail.com> wrote:
I need sed onliner, where is have 243xx as string in file[Thats the
only line in the file and xx could be anythin 'ab' 'a1' but cannot be
'1a'.] and i want only 243 to be return.
Could this be done using either sed or awk.
sed 's/\([0-9]*\).*/\1/'
hth
Ralf
Thanks Ralf,
I have a long way to go in sed. it looks so simple though!
You'll be well-served by learning regular expressions; they're used in
sed, vi, perl, python, grep, Java, ruby, etc. The details differ in
different implementations, but most of the core ideas (including,
e.g., the [0-9] stuff) are the same everywhere, so you needn't feel
like you're putting a lot of time into learning _just_ sed.
Just keep in mind that they aren't general-purpose parsers, and thus
aren't applicable to all problems. They're great for certain tasks,
and incredibly powerful for one-off search or replace operations and
for dealing with some kinds of texts. But there is a kernel of truth
in Jamie Zawinksi's (author of XEmacs and the Unix version of
Netscape, among other things) famous observation, "Some people have a
problem and think, "I'll use a regular expression." Now they have 2
problems!" If you're trying to shoehorn them into, say, matching
nested parenthesis or other moderately complex operations you need to
think about a parser.
Still, when they apply they're powerful and fast. And they apply
surprisingly often. |
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