Hi, I'm totally new to Unix. I'm an MVS mainframer but ran into a situation where a Unix server I have available will help me. I want to be able to remotely connect to another server using FTP, login and MGET all files from it's root or home directory, logout, then login as a different user and do... (1 Reply)
need a shell which perform following function
file 1 ( every time new data comes)
1212
2323
3434
4545
5656
.
.
.
.
file 2 (fixed line)
update bc_tbl set aix=data , bix=back where cix=U and serial=;
now when i execute shell it will concatinate file 1, file 2 & make file 3 as... (3 Replies)
I have directory structure sales_only under which i have multiple directories for each dealer
example:
../../../Sales_Only/xxx_Dealer
../../../Sales_Only/yyy_Dealer
../../../Sales_Only/zzz_Dealer
Every day i have one file produce under each directory when the process runs.
The requirement... (3 Replies)
Hi, I want to create a batch(bash) file to combine 23 files together. These files have the same extension. I want the final file is save to a given folder. Once it is done it will delete the 23 files.
Thanks for help. Need script. (6 Replies)
I have a file named "file1" which has the following data
10000
20000
30000
And I have a file named "file2" which has the following data
ABC
DEF
XYZ
My output should be
10000ABC
20000DEF (3 Replies)
Hey!
I wanted to find a text version of the Bible for purposes of grepping. The only files I could find, (in the translation I wanted), were Old Testament.txt and New Testament.txt. I thought, "fine, I'll just concatenate those two, no problemo." But when I unpacked them, turns out they had each... (22 Replies)
Hi All,
Need your help.
I will need to concatenate around 100 files but each end of the file I will need to insert my name DIRT1228 on each of the file and before the next file is added and arrived with just one file for all the 100files.
Appreciate your time.
Dirt (6 Replies)
Hi
I am trying to learn linux step by step an i am wondering
can i use cat command for concatenate files but i want to place context of file1 to a specific position in file2 place of file 2 and not at the end as it dose on default?
Thank you. (3 Replies)
- Concatenate files and delete source files. Also have to add a comment.
- I need to concatenate 3 files which have the same characters in the beginning and have to remove those files and add a comment and the end.
Example:
cat REJ_FILE_ABC.txt REJ_FILE_XYZ.txt REJ_FILE_PQR.txt >... (0 Replies)
Discussion started by: eskay
0 Replies
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)