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text serach in unknown file
Post 42145 by Perderabo on Wednesday 22nd of October 2003 04:15:38 PM
10-22-2003
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.
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.
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.
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LEARN ABOUT LINUX
dh_movefiles
DH_MOVEFILES(1) Debhelper DH_MOVEFILES(1) NAME
dh_movefiles - move files out of debian/tmp into subpackages SYNOPSIS
dh_movefiles [debhelperoptions] [--sourcedir=dir] [-Xitem] file...] DESCRIPTION
dh_movefiles is a debhelper program that is responsible for moving files out of debian/tmp or some other directory and into other package build directories. This may be useful if your package has a Makefile that installs everything into debian/tmp, and you need to break that up into subpackages. Note: dh_install is a much better program, and you are recommended to use it instead of dh_movefiles. FILES
debian/package.files Lists the files to be moved into a package, separated by whitespace. The filenames listed should be relative to debian/tmp/. You can also list directory names, and the whole directory will be moved. OPTIONS
--sourcedir=dir Instead of moving files out of debian/tmp (the default), this option makes it move files out of some other directory. Since the entire contents of the sourcedir is moved, specifying something like --sourcedir=/ is very unsafe, so to prevent mistakes, the sourcedir must be a relative filename; it cannot begin with a `/'. -Xitem, --exclude=item Exclude files that contain item anywhere in their filename from being installed. file ... Lists files to move. The filenames listed should be relative to debian/tmp/. You can also list directory names, and the whole directory will be moved. It is an error to list files here unless you use -p, -i, or -a to tell dh_movefiles which subpackage to put them in. NOTES
Note that files are always moved out of debian/tmp by default (even if you have instructed debhelper to use a compatibility level higher than one, which does not otherwise use debian/tmp for anything at all). The idea behind this is that the package that is being built can be told to install into debian/tmp, and then files can be moved by dh_movefiles from that directory. Any files or directories that remain are ignored, and get deleted by dh_clean later. SEE ALSO
debhelper(7) This program is a part of debhelper. AUTHOR
Joey Hess <joeyh@debian.org> 8.9.0ubuntu2.1 2012-06-12 DH_MOVEFILES(1)