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)
Hi Friends,
I have a requirement
I need to concatenate the below two strings.
String 1 = /@jobid_at_
String 2 = value stored in ORACLE_SID
String 3 = string1 concatenated with String 2.
Please let me know how should i do it in UNIX.
Thanks, (2 Replies)
if i use
echo "ravi"
echo "sankar"
it showing output
ravi
sankar
but i want output as ravi sankar
remember sankar should be in another echo statement only (2 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 need to know how to concatenate variables in Debian. I am making a interactive script where it ask the user for info to add a user I pull the first letter from the first middle and last name into individual variables now i want to put them all in one variable so i can put it into useradd command ... (4 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)
Hi,I'm trying to concatenate @example.com to each line of a file f1.txt. and push it into f2.txt. Here is the code i'm using.
for i in `cat /home/linux1/xxxxxxx/f1.txt`;
do
echo ${i}@example.com > /home/linux1/xxxxxx/f2.txt;
done
But above code only printing @example.com in f2.txt. what... (18 Replies)
Hi. I'm new to this forum.
I am attempting to parse an Audit Log from Cognos/TM1, selecting only Event IDs of "client" which are found on the "start-tag" record. These Logs are in a pseudo-XML format but not a true XML format. I want to FTP an Audit Log File from the Cognos server to our UNIX... (7 Replies)
Discussion started by: FredAtArrow
7 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)