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Re: apt-cache regex question

On 12/03/11 19:25, Camaleón wrote:
On Sat, 12 Mar 2011 18:17:47 +0000, Camaleón wrote:

On Sun, 13 Mar 2011 19:22:38 +0200, Πρεκατές Αλέξανδρος wrote:

apt-cache --names-only  search  '^a'  except from packages name started
with 'a' (intented)  will also  give packages that they have a source
file whos name starts with 'a'. is that an error?


Hum... from man "apt-cache" page:

search regex [ regex ... ]
search performs a full text search on all available package lists for
the POSIX regex pattern given, see regex(7). *It searches the package
names and the descriptions for an occurrence of the regular expression*

(bolded text is mine)

So, no, I think you are getting the documented behaviour ;-)

No, wait, the above argument has a big hole. Man page continues (I did
not carefully read, my bad...):

If --full is given then output identical to show is produced for each
matched package, and if --names-only is given then the long description
is not searched, only the package name is.

So indeed, only package name should be queried in the regex which does
not seem to be the case. I also get false positives, for example:

sm01@stt008:~$ apt-cache --names-only search "^a" | grep sleepd
sleepd - puts an inactive or low battery laptop to sleep

But here, even the source package is named "sleepd", why the regex is
catching this? A bug? :-?

I suspect the man page is a bit ambiguous. It looks like --names-only searches on things other than package name, but not the long description. Possibly matching on "Provides: apm-sleep"


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