text serach in unknown file Post: 42145

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Top Forums UNIX for Advanced & Expert Users text serach in unknown file Post 42145 by Perderabo on Wednesday 22nd of October 2003 04:15:38 PM

10-22-2003

Administrator Emeritus

Quote:

Originally posted by Kelam_Magnus
Perderabo,

How do you get 746 files for the 2 character names? 254 *2 is 508...

___________________________________
one other way that is a simple loop...

cd /dir/to/check/

for name in `ls *`
do
grep "where john is going" $name
done > file.out 2>err.out

This will capture the output in a file and any errors.

The thread that would not die... Smilie

First, your "ls *" is going to have the same problem. There too many filenames to build the list all at once.

As for how I did the math. We want to build a list of 1000 filenames and we want the list to be as short as possible. We start by using as many 1 character filenames as possible. There are 256 possible values for a byte. But you can't use null for a filename. Nor can you use /. So that gives us 254 possible 1 character filenames. But we want 1000 filenames. 1000 - 254 = 746. We still need 746 more filenames. We will make those 2 characters long because we want the list as short as possible. At this point, we have (254 + (2 * 746)) = 1746 characters in our list of filenames. But we can't run the names together. We need a space between the names and that takes 999 spaces. So 1746 + 999 = 2748 is the shortest possible list of 1000 files.

Now here is a confession... my logic that jyotipg praised has a flaw. And the correct answer is actually 2751. But I won't tell why. I know that you'll enjoy finding my flaw on your own. Smilie

Perderabo

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LEARN ABOUT CENTOS

drop_text_search_parser

DROP TEXT SEARCH 
PARSER(7)				  PostgreSQL 9.2.7 Documentation				DROP TEXT SEARCH PARSER(7)

NAME

       DROP_TEXT_SEARCH_PARSER - remove a text search parser

SYNOPSIS

       DROP TEXT SEARCH PARSER [ IF EXISTS ] name [ CASCADE | RESTRICT ]

DESCRIPTION

       DROP TEXT SEARCH PARSER drops an existing text search parser. You must be a superuser to use this command.

PARAMETERS

       IF EXISTS
	   Do not throw an error if the text search parser does not exist. A notice is issued in this case.

       name
	   The name (optionally schema-qualified) of an existing text search parser.

       CASCADE
	   Automatically drop objects that depend on the text search parser.

       RESTRICT
	   Refuse to drop the text search parser if any objects depend on it. This is the default.

EXAMPLES

       Remove the text search parser my_parser:

	   DROP TEXT SEARCH PARSER my_parser;

       This command will not succeed if there are any existing text search configurations that use the parser. Add CASCADE to drop such
       configurations along with the parser.

COMPATIBILITY

       There is no DROP TEXT SEARCH PARSER statement in the SQL standard.

SEE ALSO

       ALTER TEXT SEARCH PARSER (ALTER_TEXT_SEARCH_PARSER(7)), CREATE TEXT SEARCH PARSER (CREATE_TEXT_SEARCH_PARSER(7))

PostgreSQL 9.2.7						    2014-02-17						DROP TEXT SEARCH PARSER(7)