negatively concatenating files Post: 302213625

8 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

concatenating x files into a one...

... i have 4 files to concatenate but in a certain order and i wanted to do it in a shorter one line command , if possible ! 4 files : file , file0 , file1 and file2 file1 into file2 file0 into the result file into the result thanks in advance Christian

2. UNIX for Dummies Questions & Answers

Concatenating records from 2 files

I'm trying to concatenate records from 2 files and output it to a third file. The problem I'm running into is that it seems like the "While" command is limited to processing one file at a time. It seems like you could read a record from file1 into a variable. Then do the same for the for file2....

3. Shell Programming and Scripting

Concatenating two files

HI I need to concatenate two files which are having headers. the result file should contain only the header from first file only and the header in second file have to be skipped. file1: name age sriram 23 file2 name age prabu 25 result file should be name age sriram 23 prabu ...

4. UNIX for Dummies Questions & Answers

Concatenating Text Files

Hi, I have 30 text files on UNIX that I need to concatenate and create one big file. Could anyone provide me with a solution (if one exist)? I need the answer asap (today). Thanks a lot. Denis

5. Shell Programming and Scripting

concatenating similar files in a directory

Hi, I am new in unix. I have below requirement: I have two files at the same directory location File1.txt and File2.txt (just an example, real scenario we might have File2 and File3 OR File6 and File7....) File1.txt has : header1 record1 trailer1 File2.txt has: header2 record2...

6. Shell Programming and Scripting

Concatenating 3 files into a single file

I have 3 files File1 C1 C2 c3 File 2 C1 c2 c3 File 3 C1 c2 c3 Now i want to have File1 as C1 c2 c3 I File2 as C1 c2 c3 O File3 as c1 c2 c3 D and these 3 files should be concatenated into a single file how can it be done in unix script?

7. Shell Programming and Scripting

Concatenating two files in required format

Firstly one of my mysql queries will yeild following output +-------+---------------------+-------------------+----------------------------------------------------------------------------+ | ID | PLATFORM | SORT_NAME | DESCRIPTION ...

8. Shell Programming and Scripting

Concatenating 2 lines from 2 files having matching strings

Hello All Unix Users, I am still new to Unix, however I am eager to learn it.. I have 2 files, some lines have some matching substrings, I would like to concatenate these lines into one lines, leaving other untouched. Here below is an example for that.. File 1 (fasta file): >292183...

LEARN ABOUT DEBIAN

bup-margin

bup-margin(1)						      General Commands Manual						     bup-margin(1)

NAME

       bup-margin - figure out your deduplication safety margin

SYNOPSIS

       bup margin [options...]

DESCRIPTION

       bup margin  iterates  through  all  objects  in	your  bup repository, calculating the largest number of prefix bits shared between any two
       entries.  This number, n, identifies the longest subset of SHA-1 you could use and still encounter a collision between your object ids.

       For example, one system that was tested had a collection of 11 million objects (70 GB), and bup margin returned 45.  That  means  a  46-bit
       hash  would be sufficient to avoid all collisions among that set of objects; each object in that repository could be uniquely identified by
       its first 46 bits.

       The number of bits needed seems to increase by about 1 or 2 for every doubling of the number of objects.  Since SHA-1 hashes have 160 bits,
       that  leaves 115 bits of margin.  Of course, because SHA-1 hashes are essentially random, it's theoretically possible to use many more bits
       with far fewer objects.

       If you're paranoid about the possibility of SHA-1 collisions, you can monitor your repository by running bup margin occasionally to see	if
       you're getting dangerously close to 160 bits.

OPTIONS

       --predict
	      Guess  the offset into each index file where a particular object will appear, and report the maximum deviation of the correct answer
	      from the guess.  This is potentially useful for tuning an interpolation search algorithm.

       --ignore-midx
	      don't use .midx files, use only .idx files.  This is only really useful when used with --predict.

EXAMPLE

	      $ bup margin
	      Reading indexes: 100.00% (1612581/1612581), done.
	      40
	      40 matching prefix bits
	      1.94 bits per doubling
	      120 bits (61.86 doublings) remaining
	      4.19338e+18 times larger is possible

	      Everyone on earth could have 625878182 data sets
	      like yours, all in one repository, and we would
	      expect 1 object collision.

	      $ bup margin --predict
	      PackIdxList: using 1 index.
	      Reading indexes: 100.00% (1612581/1612581), done.
	      915 of 1612581 (0.057%)

SEE ALSO

       bup-midx(1), bup-save(1)

BUP

       Part of the bup(1) suite.

AUTHORS

       Avery Pennarun <apenwarr@gmail.com>.

Bup unknown-															     bup-margin(1)